\\IIIII IIIII ~~~~~~llll]~~llll~~~~ l~illm~ll\1111 Ill\ Ill\ 3 DODD 0046668 0

DEPARTMENT OF THE ARMY TECHNICAL MANUAL ·

AF. AMPLIFIER /

AM-465/FR

, . :: B · TAK j · FRO; I

DEPARTMENT OF THE ARMY •BNOVEMBER 1954 \

WARNING

DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT

Be careful when working on the 250-volt plate and power supply

circuits, or on the 115-volt ac and de line connections.

DO NOT TAKE CHANCES!

I '

...

TM 11-5101

'l'ECIINlCAL ?\f.\.XUAL1 No . 11- 5101. f

DEPARTMENT OF THE ARMY 'v'hsniNG'l'ON 25, D. 0., 8 Novemberl195ft.

AF AMPLIFIER AM-465/FR

CIIA.l"l' I:]H I . 11\TRODlJCTlON Sectio n I . C:cncral

II . Dc~crip t.ion and clat a _ Cn!l l"l' lm 2. JN,'T ALLATION AND OPI-:tlAT[QN

Sectio n T. Service upon receipt of AF A mplifi er A.i\ 1--165/FTL lJ . lnRtallat.io n __ ___ _

HI. Ope rat ion _ CI!AP'L'8 1\ 3. ORGA lZATIONAJ, '\ fA I N TI•; l ANC I·:

Sect io n I. ll.

r J I. I V.

Org::tni xat.ional t.ool. and equipment. __ _ Pn,,·en ti,·c maintenance sen ·i C" CS _ Lubrication a nd woat.licrp roofi n14 _ Troubleshooting; at orp;ani zat ionn.l n1aint c nanco lc,·el TH I~OH.Y __ _ Pl i ~ LD :\I'AJ T I.;NANC' I ~

Paragraphs

I, 2 3- 9

10- 1-1 15- 20 21- 23

24 , 25 2G- 2U 30- 32 33- 3G 37- -12 CII AP'l' lcll 4.

C 11 " Pl' l, l{ 5. flPcLion I. Tro ubleshooting M fielclm a inlC11ancc h.! ,·eL _ 43- 50

JJ . 11.1.

Gll !IP'l' l"'lt G.

R epa ir s ___ 51, 52 Pinal tcs li np; __ _ 53- 55 SIUP.i\1'1-:N'r AND 1,!1\IWI'I<:D STORAGE AND DE:\IOLI-

TION TO PlWV I~NT I.:N IS'\fY USE Sectio n I. Rhip mcnt ancl limi Lccl sLora~c __ _ 5G, 57

- 5 ' 5\l TL D t• ln olit.io n of matcricllo prcvcnL C' IICrny usc _____ _ l NIH1X __ _

P aoe

3 3-6

7-10 10-15

16

18 18- 21 21- 22 23-24 25- 29

30- 36 36 37

38 38 41

I

'

' ' T.M 5101-22

F·ig~we 1. AF Amplijle1· AM-.!,65/FR.

2 '

· . .1

CHAPTER 1

INTRO[)UCTION

Section I. GENERAL

1. Scope · This manual contains complete instructions for

the insta1lation, operation, maintenance, and re­pair of AF Amplifier AM -465 / FR (fig. 1) . These instructions apply only tb the audio-frequency ( af) amplifier as a single unit.

2. Forms and Records

The following forms will be used for reporting unsatisfactory conditions of Army equipment and when performing preventive maintenance: . a. DD Form 6, Report of Damaged or Improper Shipmen~, will be filled out ~mel forwarded as pre­scribed in SR 745-45-5 (ARMY), Navy Shippinrr Guide, Article 1850 (Navy), and AFR 71-4 (Ai~ Force).

b. DA Form 468, Unsatisfactory Equipment Report, will be filled out and forwarded to the Office of the Chief Signal Officer as prescribed-in SR 700-4:5-5.

c. DA Form 11-238, Operator First Echelon Maintenance Check List for Signal Corps Equip­ment (Radio Communication, Direction Finding, Carrier, Radar) will be prepared in accordance with instructions on the back of the form (fig. 15).

d. DA Formll-239, Second and Third Echelon :.\faintenance Check List for Signal Corps Equip­ment (Radio Communication, Direction Finding, Canier, Radar) will be prepared in accordance with instructions on the back of the form (fig. 16).

e. Use other forms and records as authorized.

Section II . DESCRIPTION AND DATA

3. Purpose and Use

AF Amplifier AM- 465/FR is a single channel, . high fidelity, high gain, low distortion amplifier designe~ to raise the output of preamplifiers or mixers to a level suitable for feedin rr broadcast telephone lines or radio transmitter in1~1ts. It may ~e used as a bridging amplifier for isolation or

· other applications where a 20,000-ohm amplifier input is desirable. The usefulness of AF Ampli­fier AM-465/FR as a single unit is limited to use as an emergency monitoring amplifier (2 ,.,.ratts

N~ n LE TUR TAB

.

.

~ PRE- + r.:-- MIXER

AMPLIFIER

MICROPHONE"

output). The amplifier has a plug-in type chassis allowing easy removal from . shelves or racks for servicing or interchanging units .

4. System Applications a. AF Amplifier AM-465/ FR is used to pro­

vide a signal level suitable for audio transmitter inputs. Terminal interconnecting plugs, supplied with the equipment as accessories, are used fqr interconnecting units. A simplified block dia­gram in figure 2 indicates the system set up. In

vu METER

AF AMPLIFIER LIMITER TO AU 010

AM-465/FR AMPLIFIER TRANSMI TTER

TM 5101 -2 li'ig~we ~. Ali' Am1Jz.ijie1· AM- 46iJ / PR, syst em appz.ica.tion.

3

I

this application the a,f amplifier is used to build up the output signal of a mixer to a level suitable for operation of a limiter prior to application to a transmitter.

b. The af amplifier may be used as a line matcll­ing amplifier. The amplifier may be used with amplifiers having provision~s for 150- or 600-ohm balanced or unbalanced input.

c. If there is a loss of the high or low :frequen­ci~s in the overall system application, the nf ampli­fier can be altered to compensate for the loss.

5. Technical Characteristics

4

Power requirenu•nts ________ 100 to 130 volts, 50 to GO cps, 55 watts.

1<'use rating _________ ___ __ __ 1 ampere, type MDL. Number of tnbes __ _______ __ _ 4.

Sonrce impedance----··--- --- GOO or 150 ohms. Input impedance:

Matching ___ . GOO or :JGO ohms (approx). Bridging ____ 20,000 ohms (approx).

Mnximum input level: Matching in-

put ------ +ll dbm for 1% total rms eli ·tor­t ion from 30 to 15,000 cps (output +30 clbm).

Bridg-ing inpu L +30 dbm for .5% total rms clis tor­ti on from 30 to 1G,OOO cp · (on t­pnt +18 dbm).

Load impedance (tapped trans-former)------ GOO ohm.· balanced (taps for 150,

15, 7.5, and 5 ohms). It a t e d output

level _________ +30 tlbm with .5% total rms dis-

Gaiu:

tortion from 50 to 15,000 cps ; +30 dbm with less than 1% total nus di stortion from 30 to 15,000 cps.

Matching in-put------ G5 db ±1 db, GOO- or 1GO-ohm source

to GOO- or 150-ohm load. Bridging in-

put------ 28 db from a GOO-ohm terminatetl line to a 600- or 150-ohm load; measured at 1,000 cps with VA control in maximum position.

l!~requency

response _____ ±1 db (referred to 1,000 cps) from 30 to :15,000 cps ; measured from either GOO-ohm or 150-ohm source to 600-ohm lo::ttl wi.th either bridg­ing or matching inputs.

Noise leveL ____ Less than -48 dbm with VA con-trol in maximum position and in­put ancl output circuits termi­nated in 600 ohms.

Isolation------- 00 db with matching input. 100 db with bridging input.

Connection ----- Tll'o 10-prong plugs, mounted on rear panel of chassis, which en­gage with two i·eceptacles pro­vided with amplifier.

6. Packaging Data a. \i\Then packaged for export shipment, the

, components of AF Amplifier AM-465/FR are packed in a moisture-vaporproo:f corrugated con­tainer which is placed in a wooden crate. An ex­ploded view of a typical component packed for export is shown in figure 4. The size, weight, and volume of the container nrc indicated in the fol­lowing chart: ------

Vol- Unit H eight Widt.h Depth urno Wet~:ht

{ ln.) (ln.) (in.) (cu It) {lh)

--- ------ - --

·w ooclen crate (exporL) __ __ 19% 12}~ 14% 2 50

b. The following list indicate the contents of the container. See the packing list attached to t·he container for exact contents.

Cont.uin er rlimens ions (in.) Con tents Notes

Hi}'s x JO% x 131~ - - -- 1- AF Amplifier With tubes in AM- 465 /FR place. chass is.

7. Table of Components

R e- IT ei ght Depth Length Uni t Component qu i red (iu .) (ln.) (ln.) weight

N o. (I b)

- ·--------

AF Amp lifier AM- 465/Fll _ 1 6% 12 8 1 8~

Input H.oeeptacle for JL __ 1 Ys Ys 2)1. y. Output Ti cceptacle for J2 _ 1 Ys Ys 2Y. y. Set of mounting hardware_ 1 set Ys 1 1% y. H.unning spares __________ 1 set 4 1)':! 1 1~

Technical Manual TM 1 ] l - 5101, AF Amplifier AM- 465/Fll.

Packing lis t_ ___ __ _____ __ . --- - ----ToLal ___ ________ __ --- -- - - --- ----- ---- - 20%

Note. This lis t for general information only . ~See ap­propriate supply publi cations for information pertaining to req uisiLion of spare parts.

8. Description of AF Amplifier AM-465/FR AF Amplifier AM-465/FR consists of a single

chassis upon which are mounted three audio am-

V. 3

: V4

VI,V2

1 .

--

Jl J2

Fl

TM 5101-4

P if}llrc " · R11n11i111J SJWres.

5

plifier. tages and a power ·up ply. .A compleLely assembled amplifim· is shown in figure 1. Pro­visions are made for controlling tl1 e ga in of the amplifier, for adjusting the hum to a minimum, and for checking the operation of each tHbe. The VA (gain) control is mounted on the left side of the amplifier front panel fl.l <.1 the METER switch on the right (Iig. 1'1). The IIUM adjustment po­tentiometer is mounted on tor of the chassis in front of the out]. ut transfo1·mer (fig. 14) . Con­nections to the amplifier are made directly to plucr )ocated on the rear of the chassis. The plug marked J1 i : the input n,n l the 1 lug markel .J2 is the output (Iig. 5).

6

9. Running Spares

A g roup of running spares ( !ig. 3), pa ·keel in t~e pa ·king ·a1'ton of AF Amplifier AM..-L.l:65/FR, IS

supplied with ea ·h amplifier. 'p~tres are pro­vided for all normally ex pen Lable items such as t 11be., receptacles, and .fuses. The following is a li sL of r nnning spares :

J-Tube 5Y3GT. J-Tubc - 6J7. 1-Tube - GLG. :J-Fuse: , 1 amper , Lype MDL. !-Receptacle, in[ ut. 1-RecepLacl , output.

CHAPTER 2

INSTALLATION AND OPERATION

No /c. 'l'h i. · (·haple r illuslmtes nntl f:ur ni sll s lhe operator suffici ent information pertaining to the var ious con­trols nntl inslrumenl s pro\·ill ctl J'or I he propPr op mt·ion of t·he eqn ipnwnt.

Section I. SERVICE UPON RECEIPT OF AF AMPLIFIER AM-465 / FR

10. Unpacking and Checking New Equip­ment

Note. l! or used or recondi t ioned equipment r cl'er to paragraph 14.

a. Oeneml. For dom estic shi pment, equipment is pn.ckC'cl in cotTug<ttecl fiberboanl ca1ton · ( c be­low). FOl' oversea sh ipment, I: he equipment is p::t ckecl in do 11 ble fibetlJoard car tons with a mo is­tm·e-va.porproof barri er , packed in a wooden crate (b below). A packaging d iagmm for ex por t anl domestic sh ipment is ·ho11·n. :in fi gure LJ:.

Caution: Be carcfttl. 'vhei1 unpackillg and handling the equipment, it is ea: ily dam::~ged. H it becomes dnmagecl o1· exposed, a complete over­haul m io·h t be requi red o1· the equipment mn.y be rend ere l u eless.

b. Onpaclcing Equipment P ack cl jo1· Ove1'8ea hipment. Perform all the steps outl ined below

when unpa king equipment pn.ckagecl for oversea. shipment. \iVhen unpa king equipment packaged for domestic h ipment, omit the steps described in (1) below.

(1) Remove the nails from the top anl one side of the wooden case ·with a wt il puller. Removo the top. Do not attemr t to pry off the sides and top; the equi[ ­ment may be chma.ged.

(2) Cut n.nd fold back top of fiberboard con­tainer.

(3) Remov:e the mo istureproof banier.

( 4) Cut and fold back top of inner fi berboanl container.

(5) Remove tho equipment f rom if·s inner container.

(G) Inspect the equipment for I ossible dam­ngc .incunecl in . hipment.

(7) Check ontents of packing case against master packing lip.

c. Unpacking Don~ stic Paclcing Oases . Follow b (2) through (7) above for unpacking domestic pack ing cases.

Note. Save t il e pnck ing case and carton s. 'l'bey can be u. ·ed a"ain when the equipment is r packed f:or . torage.

11 . Insta llation of Tubes and Capacitors

Instructions for ch ek ing the in tallati.on an l locrttion of tubes tUld car acito r · are as follo,v. :

a. J.'~tb es. \Vi th the power OFF-ON witch in the OFF po .iti on, check to be sure that the tubes are in their proper so ·ket: a shown in figure· 5. The tube type for each socket is stenciled on the chas. i. near the ocket. Mount the two g1: id caps and the grid mp shi eld: on tubes \ 1 mel V2 (type 6J7). Each shield 11111st make <t good electrical connection to the sl1ell of the tube to insure noi. e­free operation .

b. Elect?'olytic Oapacito1's . The :four electro­lytic capacit01·s, C2, CD, ClO, and Cll, should be in the red sockets provided on the amplifier chassis (fig. 5) . Carefully che k each capacitor to be sure thnt the rati11g marke l on the capacitor cove r correspon 1. to tho vn.h te . tencil ed on the cha sis adjacent to the socket .

12. Receptacle Connections

T o place the equipment in operation, it is nece -snry to fabri cate cables for th input and output receptncle: thnt mate wi tlt the input and utput

7

8

CREPE WADD ING-----

FOLDING BOX------

SILICA GEL~

~

200LB MULLEN TEST CORRUGATED ~ ~ FIBERBOARD CARTON ~

MOISTURE- VAPO RPROOF BARRIER

PRE PACK RUNN ING SPARES

1------- TOP TRAY

1--------- PARTITIONS

COLLAR

BOTTOM AND SIDE SUPPORT

f-'i{!ll rr• 1. f'll ('/;(lyj II!/ rf illf1/'(/ Ill.

MOISTURE ­VAPORPROOF DOMESTIC

MOISTURE­VAPORPROOF EXPORT

™ 5101-n

TM 5101-3

I'i{JIII 'C 5. .!lP A m7J1ifier clM- .16:1/ l l'fi , oila ss is. top 'V ie le.

plug mounted on the clHts. -i ·. Pan.tgmphs 17 and 18 contain the necessary information for proper termination of the input and output wiring. The connections to the two 10-prono- receptacles that mate with the nmplirter plngs mounted on the chns. is are ]i ted below.

l npu t ltcccptal'lc .II

'l'ermi­ntt l :\o.

3 K o co nnection. 4 No co nn ection. 5 Bridging pad inpu l. . (i Bridging p ad inpul ..

Co nnection

7 Output, of b ridgin g pad. 8 Tes t mete r ( +). n Output, o f bridging pad .

10 Amplifier ground . 1 L i\latching inpuL (g rou nd s iclP) . 12 i\latching inpu l..

3221 30- :i·l--2

'.l'cnni­nnl No.

5

Ou t put Hcccptaclc J 2

Co nn ection

Output, t ransform er, 5-ohm lap. Output t ran. former , cente r tap. Ac inpu t, to power transformer (lo 8 1).

6 Ac input LO power transform er. 7 Output lransfo rmer , 7.5-o hm lap. 8 Output t ransform er, cen ter t.ap . n Output t ran sform er, J.5-o hn t lap.

10 Oul.pu t t ransformer. center lap. ll Output tran~fo rmer, oOO ohm s. 1.2 Output, lransfonner, oOO ohms.

13. Mounting

a. AF Amplifier ..AM-465/ FR i designed £or helf mounting. Slide the amplifi.er chassis onto

a shelf so that the plugs mounted on the chassis fit in to the recer tacles tha t have been mounted on the rear of the helf.

9

b. The VA control shaft i: on the ]cJt ide of the amplifier (front vie,Y) and th e METER switch is on the right side ( fig. 14). 1\f ount the cl ial phte. furnished with the amplif-i er in positi ons corre­sponding to the r espective shaft positions (VA d i;d to the left of the METER dia l) securi ng them in place with the bu hings, wa sher s, and nuts sup­plied. Assemble the l ar t \l"ith the heads of the bu ·hings on the in .-ide of the panel to insure clearance.

c. Should it become n eces. ary at l\ny time to r emove the amplifi er for serv.icing, first r emove the knobs and panel. Th en, pull fon1·a1·d on tl1e handles and slide out the am ] l ifi.cr.

14. Service Upon Receipt of Used or Recon­ditioned Equipment

a. Follow th e in slrtt cLions in pam g; rnph 10 ·l'or tlllpacking an 1 ch ecki.n<Y Lhc equipment.

b. Ch eck the used or recon ditioned equipmen t for t:Lgs OJ' oth er i.ndica.tions perLain in g; to ch an ges in the ·wiring of th e equipm ent. lf fLny chano·es in wiring have been ma.cle, note the ch tLnge in t hi s tu n.nunl , prefentbly on th e main sc·h emat·ic dia­gra 11 1 ( fig. 27).

c. Check t·lte opera Ling controls for e:tse of rota­t ion. H lu bri cation i .- requirccl, refe r to t h lubri ­cnJion in stru ction. in pnrag rn phs 30 through 32.

cl. InstnJl rh e equipment H ~ on(·li necl in para ­gra ph · 11, 12, and J7.

Section II. INSTALLATION

15. Input Shielding

A ll audio lead should be .·hi elded twi sted p<t ir coppe1~ ·wire, insula ted for 200 YoH.·, and need .not be larger than No.1() A \VG. _ \.1 1 joints shonld be of low r es istance and sold ered securely . H t he circuits run in condui t o1· du ct th:tt may be s ub­j ect to moi sture, 11se a type o-1' wiring that has a nu t untl or sy nthetic 1· ubber co1·c rin g over t h e shield or lea.l . To m ini mi:.-;e nn desimbl e noise pi ckup and cro:sta lk on long inpttt circuits, the shi e ld ing of th e lin es to t he input l.en ninal s of t he ampli fie r or mck should be covered with co t­ton b1·aid or other s ui tabl e insula tion an l th e shi elding should be g;J·ottnd ed onl y at the ampl i fi e1· (point o:f lowest ]eve·l s uch a. a common g round h us bar). Be SU1'e that th e shi elds m·e electri cally cont inu ous and that th e oTound connections are perfect. Do no t J·un fh e audio input lead: ad­:j<Leent to, m: Ja.ced in wit·h , n li·crtJnt·i ng-c ttrren t (ac) or hi gh-level aud io li n0s.

16. Metering Circuits

AF A mplifier Ai\1-465/ FH. ma y be 11.'ecl wi th a . ystem metering ciJ·ctti t. Th~ four -position J·otary : witch mounLe l on the :I'J'ont pane] o:l' the nmp li fi.e1· ch as.- i.- is des ig ned for thi s purpose. The method described ·in a be]o\\' is used wl1en t l1 e l\f amplifier i: used in l\ syslem . The hookup of i·he :t:l' nmp'lifi er, when met·ct·pd ns a s ingle nni. t, is de:cribed in b below.

a. The overall system meler.ing circui L mu st ttse a 20,000-?hms-per-vol t mPte r haYing a direct­cunent (de) range of 0 to 2.5 or 0 to 5 Yolt . The system also must h<Lve a metering : 1ritch with a

10

bl::tnk 1 o: iLion an.ilable. The blank p osi tion will be usecl :for tc. t ing tJ1e a I' amp li ri er. The unn . eel pin on t he external metering circui t is conneclNl to terminal of th e ouLpul H'Cepta ·]e J.l. Tel·­m in:i l 10 of th e. a me r 'ce pl ac le " . i 11 be used us t h e meter r eturn c ircu it . L a l)('l the n ew po ition o l' the exlernal melering switch as F Ampl i l'ier AJV[-4() .~ / FH. By pla ·ing ll1 e )fGTER . wiJ h, locat·Nl on the wf ampl ifi er in pos it ion 1, 2, or 3, t ubes YJ, V2 and V3 cnn he ch ec· kcd on t·lte system meter . TllC nnmbers on the MET !~R clinl 11la.te indi cat·e Lhe t ube be ing c:hcckecl . \\TiLh t l1e tubes op rn t ing no·J·mall y, lhe melPr wi ll rPacl approxi­matel y J volt.

b. H no externa l metering circui t i. available, wire termin al : 8 and 10 o f inpnl. receptacle Jl to two Lest jn ·ks. ~\[oun t th e jn ·ks. Be f:i ure t h at th e mountin g sil e se lccrecl is rC>nd il y ncces. ible. H possible, color code Lhe jacks. Usc f~ 1·ecl tesL jnck as Lh e pos it iYe Le rn i nal ( co Jnwcll'd to pin ) al1tl n. h lnck lest :jnck as l'lw n C>galil'e te rn1inal (conneetecl !o l.e rminnl 10) . Label these jacks. \ VIt en check­ing the af nmpl ifier, in se rt· the test. probes o f :Mul­l imelpr T S- .).):2 / m· equal in to the lc.'lt jack .

17. Matching Input Connections

Connect the incoming l in c · to te rminal s 11 and 12 o f lh e input 1·eceptn le o·l' inp11L plu g JL Con­n ect t he g rouncl lin e o f lhl' in comin g s io· nal to

. b

tcnlt 1nn I I~ of Lhe inpuL n 'cept ncle of in] uL ;plug .Jl. J\ lakc tmpcclanc·e ma lcl1i11g conn ections on the .input inms fonner as foll ows:

a. GOO-okm JJafancwl I n;mt. Th amplifier is wi red aL th fa clory :for GOO-ol1m balanc~cl input

Tl Tl

TO PIN 12 TO PIN 12 ON ON Jl

12 Jl

12

RIA TO TO GRID GRID OF VI OF VI

TO PIN II TO PIN II I I

ON II

ON Jl Jl

-

- A • - B

Tl Tl

TO PIN 12 TO PIN 12

12 ON '4-----Q,---~ J I

ON +---o---~

Jl 12

TO TO

GRID GRID

OF VI OF VI

II TO PIN II

ON '4--~-<>---.J II TO PIN II

0 N +---4..-o---.-/ Jl J I

--

- c D

TM 5101-6

]1'i.y11re 6. Jll atcili?lrJ inp11t comi CC iiou s on inputtran stonn e1· '1'1.

operation . Terminal 2 on .input tran ·form er Tl is connected Lo terminal . 3 and 11 (Jio·. 6@ and Jig. 27).

b. 000-ohm, Unbal(JfJUJed !rtput. Tra,n former Tl .i s w ired aL the factory fm· 600-ohm b,llanced inp ut ope l'ntion (fig. 6@) . For GOO-ohm un­balanced in,put operaLion, d i connect Lhe wire connected Lo Lerminn,l J l from Lerminal ~, a,nd con­nect it to t e l'm inall. F.igul'e 6B shows Lhe proper wiring of Ll'an sfonner T.L .fot GOO -ohm ullbaJancecl input operation.

c. 150-0hm Balancecl ln7mt . Tran. former T1 .i s wired nt the fa tory for 600-ohm balanced input operation (fig. 6@ ). Fo l' 150-ohm bn-hll1'ed in­I ut operation, remove the wire connecting termi­nals 2 and 3. t terminal 2, disconnect the wire to terminal I J and connect iL to terminal 5. Con­ne-t a junq e1· b breen Lr-1 ·minal s 1 and 2, and con­

ned a J'tnnr er between terminals 3 and 4. Figure

G@ shows the proper wir.i ng for transi'~)l·mer T1 :fo l' J50-ohm balanced input operation .

d. 150-0hm Unbalanced In put. Tra.11 former Tl is wired at the fa ctory for 600-ohm balanced

, in p ut opernJ ion (Jig . G @) . For 150-ohm unbal­<lllcccl operat ion, r emove the wire onnecting t Cl'll1 ina ls 2 and 3 on Tl. At termin al 2, di con­ll(~ct the " ·ire connected to terminalll and connect it lo tenninal 1. Connect terminal 1 and 2 to­geth er a.ncl connect t enninnl · 3 and 4 togeth r. F ig ure 6 @ show. the I roper wiring of trans­l'ormer T 1 for 150-ohm unbalanced input' opera­Lion.

e. Balcmcecl B1·idging I nput Conn ction . For balanced brid o· ing input connection . , wiring change· are made on the input plug. Input tran -former T1 i connected for 600-ohm balanced input. onnect the incoming line to terminal 5 and G on the input re eptrrcle for pluo· Jl. On

11

the smne recel!ta clc connect tern inals 7 and 12 too·e t lH.' l' and conne ·t term inn ls !) ftnclll tog-r_tl:cr. Tl~o so.l i~lline on fi g ure 7 showthe proper :Vll '~ng­of inpHt receptacle plug JJ' if balan cE' cl bn<lgmg

inpnL opemtion is 11. cd.

TO TERMINAL I ON Tl ,..._

TO TERMINAL 4 ON T2 ,..._

----11

BRIDG ING P4D

OUTPUT

't I I

BRIDGING PAD

INPUT

++ I I

INPUT LEADS

4 -TM 5101-7

}l'ift /1 1'() 7. Ba.lan ced. brirlg ing •in7mt conn ections on inJJIII ?·ecep t:acle Jo1· 11l11g JJ.

600-0HM IMPEDANCE

15-0HM AC POWER IMPEDANCE INPUT

150-0HM 7.5-0HM 5-0HM IMPEDANCE IMPEDAN CE IMPEDANCE

TM 510 1- 8

' ' ' i!f'lll'e 8. 0'11111111 l'('('f' Jllfi Gi c ('111/IICG/. irm s for 1!111!1 ,/2.

18. Output Plug Connections

a. Output Connections . The amplifier is win•d

Jor operation into a Vftr iety of load impechncPs. The secondary winding of output transformer T2 is provided with :t n ·:m.b er of taps brought out to n;e terminal s of outpu t 'plug J 2, mounted 011

th e r ear of the amplifi er cl1ass is (di.rect'ly behin<l the power transform er). Tl1e center tap of i li t> outp n t transformer se ·onclary winding ( ten n i nn I 8 011 the output transformer) is co nnected tote r­min:d s ~~, 8, and 10 of co nnection plng J 2 ( fi g. 27) .

12

Co 1111ecLion to the plug J2 is Jllade by mea11 s of th r J·eceptacle suppl i d with rach amplifier . Fig­lll 'e 8 shows the proper wi1 ·i ng of ihe outpnt re­c·ppi aele for plug J2 for the u. e of variou load imp.e<la:nces. The :foll owing tab'le gives thr lin!:' <.:01111ee t ions for load o E various impedances.

(i00 o l11n ~*

I :)0 ohm ~

I Ii ohms __

7.5 O ill ll~

Ii ohm~ _ _

Output COili1C('I io11s for plug .1 2

II and 12. 10 and II.

!l and I 0. 7 ancl 3 and -1.

'GOO oh111s wi nd ing has a CCilll'l' la p (tcnn lnnls I, R, and 10 on .1~) .

l1 . Jlc Powu 'UJJply. Til a · lin e is COlln t'<.;led to trnninaJs 5 and 6 of Lhe output. recrptncle (on onLp ut plug J 2). Figure 8 s il oll's t ll e proper con­nect ions o·f th e ac powr1· line to tile output re ep­ta c lc ·for ph1o· J2. To i11 surr a lo 11· hum lnel th e ac suppl y circuit should be s hi c ld t'cl ancllhe shi eltl ground ed to a common o· t'O III HI !Jus bar.

19. Circuit Modifications

a. Jl c Po1.ve1• SuJJply. l~oll'rr t ran . fonner T3 is c·onn ected for opera.t ion fron1 a 115-Yolt ac p ower line. H the line vol t a.rre is hio·h (120 to 130 Yolts), cli sconnect t h e l'C'd a nd bla. k wir e from termina.l 11 on t r ansform er T ;> and connect, it to

Lenni na.l 12. If the lin e vol tage i.· ]ow ( 100 to 110 Yolt:), di sconnect thi s sa.nw l'rd and black " ·ire an<l con11ect i t to te rmi11 al 10 on transf ormer T ;1 (fig. 2-1·).

IJ. Ft·r~q·uency Compensat ion . The normal f re­<l11Pnc·y r c.spon:e of .AV .\ n1p lifirr \ M- h65 / FR shown by the ctn·vr i11 figure !J, is fla t throughout.

th e a11dio range. lL may be dcsinble to increa e Lh c response t~t eiLh r r t·he II ig h- l'rempwncy or low­

l'rPC]IWilC'.Y end of Lhr n111ge. If lh c' re is a partial loss of f il e ]ow frequencies i11 the t ran ·mis ion of t.i l'l' in coming .- io·nal , Uwrc lws t·o be an increase of gn i11 or eompemmtio11 at t'lw lowp r frequenc.'· e1H.l of til e a.mplifier respo11 sc. H there is a ]hntia1 :Joss ol' tl1e hi gh frcqur ncirs in th e transmiss ion of

Lil n in cmning s ig nal, t her e ha s lobe an increa e of gai11 nt tl1e hig-he r hP<jl iPit (' il's to c·ompensate for

tIt is loss. The cunes in fi g ures LO and 11 how t lw increase in respon:c t lint· 111ay ht• obtained by

<D 0 +2

::': w (/) 0 z 0 a_ (/)

w -2 0::

-4

5 6 7 8 9 I 3 56 789 1 10,000

2 20,000 1,000

FREQlJEN CY IN CYCL ES PER SECOND

Jnakiug compensation adj ustnt enls IYithin Llt e ant ­plifier, a.ccording to the instru ·tion .' in c aml d uc­low. I:E lesired, both high- and low-freCJ.I tency eompensation may be applied.

Note. Because of : li o· J1 t cli((ere ii CCs in \Yirill 1,!; :1nll tolerances of component parts, it may be necessn1·y to use capa ·i tors d iffering in vnlu f rom lho. e given iu t11e following tables to secure the desired response.

c. lnc?·easing Iiig h-F?'erf~"ency R esponse. Three curve., numbered 1, 2, ::l.J1cl 3, are ·hown in figure 10. These curves illustrate the frequency char­acteri stics of the n.mplifi.er after changes are nmde, in the circuit constants; to increa . e the high-fre­quen cy response of the amplifter by approxim ~1tely

1, 2, and 3 clecibe Is (db) at 10,000 cycles per sec­oml (cps). To obtain a f requency re.'ponse cor ­]'esponding to one on the three curves, replace the ;1,900-micJ·omi crofarad (fJ-p.:f) capacito r, de. ig-

+4

TM 5101-9

nnted \ 5 in figures 12 and27, '".ith ~t cupacitor hav­ing t·he value given, opposit the cn1·ve n11mber, in t·hp foll ow i11 g table.

I _ -2 3

Capacitor ,·a lucs

Hesponsc cun·c Ko. C5 (200 vdcw) CU,(lHCi LY ill I'll(

5, 600 8, 200

10, 000

cl. Inc?·easing Low-FTeq~t,ency Response. The cunes numbered!, 2, and 3 in figme 11 show the frequency response of the amp lifier after altera­tions luwe been made in the circuit to obbtin g reater lo,Y-frequency respon.'e. An increase of

2 20

2 56 78 9 1 2 20,000 1,000

FREQUENCY IN CYCL ES PER SECOND TM 5101-10

l l' i.!JIII'C 10. FreqnCII('!J ?'C8 JIO?ISG 1/iith 1/igh-frequ enC!) CO?njJe1/SOtion.

13

ID 0+2 ~ w If) 0 2 0 a.. If)

W-2 0::

'-4

2 20

2 20,000

FRE QU ENCY IN CYC L ES PER SECOND TMSIOI-11

Fi,fJ1tre fl . ' ''?·equenou 1·os pon8c 'IVilh low-{reqncncu compensa tion.

2, 3, and 4 db at 30 cps can. be obtained by making suitable moch .fi.cations in the circui t. To obtain a :frequency 1·esponse conespond ing to one of the three curves make the follov.1.ing ha nges:

( 1) Disconnect the yellow lead from R15 (on terminall of terminal board 1) and con­nect this lead to a compensatol.' composed

TO VI PLATE

R5 120K

TO R4

C4 .25

(FRONT

20 AF AMPL V2

6J7

SECTION) .__ .:q.__ R I 8 ><if-----+--~....___

lOOK

TO 52

NOTEs:

R9 IK

C5 3,900 UUF

I . UNLESS OTHERWISE SHOWN, RESISTORS ARE IN OHMS, CAPACITORS ARE IN UF.

2. RES ISTOR R27 AND CAPACITOR Cl5

ARE ADDED TO CHANGE THE FREQUENCY RESPONSE OF THE AMPLIF IER .

of n. 5,GOO-oh m l'e:isLol.' ;wd <L 1-m icro Earacl (p.:l') c.tp<te iLor ( in pa l'a.ll el )·. Connect the othel' side of Lhe comr ensator to R15 on tennina.l l of tenninaJ board 1. The compensn,tor may he supported by a small terminal board that can be mounted on the side wall of lhe chnssis. T he p o i-

YELLOW LEAD

T2

] Cl 5

I 1 I 3 L ________ _J

GROUND BUS

TM5101 - 12

] l'igtwe .12. l'a?·t.ial schema / iC a iogra·m, Sli !J'!Ving Changes jO?' CO?II/)011 8C£1ion.

14

ISOL AT ION 600-0HM TRANSFORMER TERMINATING

(NO TE I) RESISTOR

,---------- ----------------- --

AF SIGNAL

.GENERATOR

ATTENUA TION 1-~-+-:-:o--++---1 AF AMPLIFIER 1-~-t-:-,o--~

PAD AM-465/FR (NOTE 2) METER

I L _ ---- -- -- - ------- - ----------'-------'

INPUT OU TP UT PLUG Jl PLUG J2

NOTES :

I. MAY BE PART OF SIGNAL GENERATOR .

2 . OUTPUT IMPEDANCE OF PAD MUST MATCH INPUT IMPEDANCE OF AMPLIFIER . BALANCED OR UNBALANCED DEPENDING ON CONNECTION OF AMPLIFIER. MINIMUM LOSS 20DB, PREFERABLY ADJUSTABLE TO EQUAL GAIN OF AMPLIFIER . T M 5101 -13

Fi[Jiil'l' /.J. Freqii 611G]J 1'G8J)0118 t es t SC I II p.

I _-2 3_

tion in the eir ui t of the rcsi.tor and cap:witor, ilen t ified a.- H27 and. C15, i. shown in fig1 11 'e 12 (R27 should ha.ve a 1·a.t in g of 1 watt a11 d UJ:'5 <1 ra ti ng of 200 cl ireet- ·uren t workino· vol tage (vdcw).

(2) Repla.ee the .. 25-p:f capa i tor , lesignated C4 in fi g ures 1:2 ancl 27, " ·ith a. eapacitor that h :ts the value o·iven oppo. ite th e curved number in the foll o~Ying table.

CupaC' itor nli ucs

ll csponsc cun·c No. C·l (·100 nlcw) c:t pacit,y in J.tf

0. 03 . 05 . I

No t.c. Clw ·1;: tlle lli ;!h-Crequ enc.r re~pon se. H it i. · fo und too hi;!li , su b>: tilule a c·n pa <; ilor for CG of t be next lowe r sf':mda rd Yalue ns r qui r d.

e. l nc?'easing ]Jigh- and L ow-FI' quenoy R e­}Jonse. In appl icn!'i ons " ·he re system lo.-ses or

oth er defi ·iencies n~q 11i1 ·e an ill Crense i11 the r e­sponse at both ends of the fllldi o ·pe ·t rum, some s ni t<~bl e ombinn.t ion of high- an d low-frequency compensation <.:Hn be selected :tncl appli ed a. le­scr i bed in c a]l(l cl above.

20. Checking Frequency Response A fter m r~king- the n ece sary ·o111p011 en t ch:~n ge.

for either hi gh - or lo w-frequency co mpen. ntion ,

th e frequen cy 1·espon ·e mu.t lJ te. ted to sec whet·her th e cl esir ed Clll'Ye in eith er figure 10 or 11 i. attained. Figure 13 sho"-s the te t setup that should be n.-ed when hecki.ng :frequency response.

a. J.'est Equ.ipment R equired. The follo,T ino· test equipm ent i. r equ ired to check the frequency r esponse of t·he amplifter.

He111

D •eibel i\ Ielcr i\[1.;-22/P C:\[ or eq uaL Tl\ 1 11 -2096. Audio Osei ll alor T S- 382A/ U or eq uaL T:\I 11 - 268-IA. Alknu a lor. Yariable, TS--102/ U ____ T:\f 11- 2044.

b. J.' st 8etu[J . COJ mect an attenuation pad w iLh a mininlllm los.- of 20 db (Yariabl e ~\.ttenu ­

ttLo r T '- :1-0:2/ lJ or eq uil'ttlen t) beLwee n th e n.f sig­nal o·enentto r and termi nal .- 11 and 12. of input p lu g ,)1. T he outp ut i 1n peclan ·e of the pad must ma.tch the inpu t impeclnnce of th e n mp 1 i fi.er . Con­Jlect r~ GOO-ohm r esisto r to term ina.ls 11 a.nd 12 of out·p1 1t plug .) 2. Conn ect the lb output meter (D ecibel U eLer )[E- 2:2jP CM or equAl ) across the GOO-ohm. l'esi. tor.

r. J.' est Jl,·oceduJ'c. used. in cl1 ecki ng the :unpli fi.er :

Tl 1e foll o11'ing pro e lme i h cquency l'espon. e of the

(1) Set ihc af s ign ;tl genera.tor to 1,000 cps. (2) Tu rn the amplifier VA control to the

llln x imum clockwise position . (:> ) . \cl j u.-t the outp ut lHel of the a.f signal

15

ge neratol' and .l oss of atleJJIIHLio.n p<td Jo r an ampli f-iC' r output level o:l- .o clbm ( 0 dhm = 1 nm ). I-f the n UC'muttJOn pad is ncljusbdJle se t· its loss to equal the ga m of the ami li fi er, so that iJ1 e input level to the attonuating pn l equal s the OLlt]_)l lt level to the GOO-ohn1 loncl res istor.

(-1-) H.ecord th e input· nncl outpu t levels. (5) K eepi.ng the i npu t Jerel to the pad con-

stan[, ntry !l1c l'req ll l' JH'Y and n•cord the output leYels.

( (\) The di11:erence in 'leve ls from the 1,000-cps reference is the rC'sponse of the amplifier. ('onveni C'nt points to ch ck are 80, f:iO, 100, -1,000, 7 ,000, I OK, 1 2]{, an l J!)K cps.

(7) Check th renclings ol.l tai m•d agai nst the ClllTCS in figJJI'l' . 10 anrl 11.

Section Ill. OPERATION

21 . Controls and Their Uses (fig. 14)

The foll owi.no· table li sts the controls o f t hr a-t' 1::>

nmpl i fier nnclli. ·tc; the.i r June! ions :

Control

OFF-OX sw i tch __

\ "A con troL __ _

:'l fETEH. s\\'ilcil __ _

J11 0\' p o ,; ifiOII 1 CO I II\ CC I S fi f ampli fier to ac power sourc(• .

(;ftin of ampli fi er i,; in creased as VA eon lrol is turn ed clockw ise.

C scd in conjun ct ion "·ith any ~ uit ab le vol t.mcLer (20,000 oh 11 1s-per-voH or bet t.e r) . :\um ber on :'I IJ<.: T.l<:H. d ial p ial<' i1 1d icat.es Lube being checked. X orn1 al operation of [J JI JC'S is ind icat('[l b~· reacl in p; of I Yolt on m ' LC'r .

JTU:'I l colll roL _ _____ Acl jusLm nt. (I f II Ui\ 1 co1drol ,-ari ('S hiilll l<·1· •I of an1plifiC'r.

22. Operation of Af Amplifier a. AF Amplifi.er AM-4-65/ FR may be operated

as a hi gh Ji lelity, h igh gain , low d istortion ampli ­fier used to raise the ontput of prem11plifi ers or mixers. It al. o may be ust>d as a bridging or isolation ampli.fi.er. The 11Se oJ t·hc amplifier as a ingle unit is limited to <t mon itm·ing a.mpl in cr of 2 watts output.

b. 'J'o opera te the equipm ent, 11 se the following procedure :

16

(1) Throw the OFF-O:N . w.i tch to the OX position. Tube V4 sho1Jlcl glow.

(2) Rotate the METER switch through po­sit ions 1, 2, and 3. The meter should 1·eacl n,pp1·ox imately 1 volt in each posi­t ion. Set the switch to 0.

(3) Adj ust the VA control to the cle. ·ired volume level.

(-1-) Aclju .-t the H UM conL I'ol, with a screw dri ver , for mini lllulll hum.

(:5 ) To (·urn oil' thr eqJJi p nl t> JJ t throw the OFF-0~ s" ·itch Lo the OFF position.

Note. If, du ring Lbe operation of the equ ip­Jnent, an nbnorJllal resu lt i · obta ined, r efer to eq uipment perform n nee ch ck l i t (par. 36) _

23. Operation Under Unusual Conditions The ope ration of .\.F .. \mplif ipr XM-4-G5/ FH

1n ny LJc clifl icnlt in region . wh(' I'C extreme cold, lwa t, lllllll id i ty and moi . t ure, ·ancl conditions, etc., Jli'CYaii. lnstn1c:t ions nrc g iven hclow on pro­ccdme.· for minimiz ing (·he r ffe('(-s o f thrse llllUSUal oprl'ltt ing conditions.

a. 0 p l'cttion in A1'clic li?n({t 8. Subzero t m­J>l'ntt urcs ancl ·1 inmtic ·o11c.l i Lion s " . i1-h cold 11·eather ;dl'ect the efll iPnt operation oJ the cquip­lll en t. I n. ·( I' JJCtion . :mel p l'ecau( ions nncler u h adven;e condition follow :

(1) J landle the equ ipm t' Jl t carefull y. (~) K eep the equ ipment warm and dry.

K eep the filaments o£ v:Lcuum tubes ligh ted con sta,ntly, unl rss thi s ovet-t- nx(•s the powel' S11 pply.

(:J) Lo ·ate the mnp) ifier in.- icle a heated in ­elosure whm·e there is no danger o·f a eol l dnd't str iking t he glass t ube (Y-~)

when a door .is opened. A sudden c.ha U of cold a ir is of:ten sufn.cicnt to shattcl' th glass envelope of a heated tube. H t he inclosure is so constru ted tha t this preca,uti.on is impossible, plaee a blnnkeL or some bnnier bctw rn the sou1·ce of the draft ancl. the equipment.

('1-) Wh en an amplifier wh ich ha s heen ex­posed to the colcl .i s brought into a warm J·oom, it wi ll sta rt to .' \\'C' H [ <tiHl will con­ti nue to clo so unt.il iL rPa('hes room !en1 -

TM 5101-23

F'igtwe 11. AF' Am.plifie1' AM- .)6;j f /i'R cont1·ols.

perature. \ Vlten t he amp li f-ier ha s l'eached room tem pemture, dry it thor ­oughly . Th·is cond ition ma.y al. o a.ri se "'·hen equipm en t \\'Ul'm s up luring the clay a':fter exposure dur ing a cold nigh t.

b. 0 pe1·ation in 1'1'0JJical Climates. \ Vhen op­(• ratecl in t rop i al cl imnt·es, mo i:Lure co nliti on. arc ttt ore ncuLe than normal. Venhla t ion is usually ,·c ry poor , and the high r elat ive h umidi ty causes C'o ncl en: ation of moisture on t·he eCJuipm ent when­ever I lt e lempera.tm:e o:f lit e equipment become: lower t-lmn 01e H.mbient a.ir. To m inimi ze thi s co ndi t ion, place l ighte l electr ic bulbs nn der the amp li fier.

c. 0 peration in D e 'e?'t Climate. . Con eli t ions s imila r to those en ountered in ITol_)ical climates often preva il in deser t area:. U sc th e a me men -ure. to iJ1 sm·e proper operatioll of the eq uipm ent.

(1) The m}Lin problem ar:i s illg with equip­ment opemtion in clesmt area s i Lhe la.rge

:t~:tl ::o ;:J -1

auwun t of sand or d ust and dirt which enter the moving parts of the amplifier, . l l ·h as the step atte11ua.tors. The ideal preventive precaution i. to house the am­pi ifie1· in a dustproof helter. Since, ho1re,·er, such a building is seldom avai l­able and " ·ould require air conditioning the next best p recaut ion i. to make the bu il ding in whi ch the amplifter i located a: d ustproof a. po:sible with avai lable materials. Hang wet a king over the windo 11· · and doors, cover the inside walls wilh hea.vy paper , and secure the side wn ll · of tent: \\'i th ·and to prevent their flapping in the 1rind.

(:2) Be ure to keep the amplifi.er as f r ee from du. t as possible. Make frequent preYen­ti ve maintenance check . Pay particular attention to the condit ion of the lubrica­tion of the VA control (Rl ) .

17

CHAPTER 3

ORGANIZATIONAL MAINTENANCE

Section I. ORGANIZATIONAL TOOLS AND EQUIPMENT

24. General

a. Us Lntll y ft number of tools, materials, or tool equipment kits are f 11rnisheclwith the equipment or Sii p pli ecl to the orgnni :.-:ation fm · use with th e l'q u i pm en t.

(,, Th e actual a ll cJirah le organi ~: nt'i o nal m :t in ­t·enan ce t·ha t C<Lll be pC' d o r1ned on .\Y .\mplif·ic r . \.M- 1-65/ FR i.· depend ent· t·o a la.rge ex t·ent· on th e cx isli no· mi li tary r ef[ulnt ion: (S tn ndanl Opemt­.ing P roced ure) , t he exi st ing tact ica 1 s it uation , ancl nl so on the tools anc·l test equipm ent suppli ed m· :1\' H ila blc.

25. Tools and Materials Supplied With AF Amplifier AM-465/FR

Tools nncl materi als requ ired for tJ 1e organ iza ­t iona l main tenance of the a mplifi er ar e li ted in rt and b below. S ignn] Corps stock num ber s. fol ­low th e mnterial. used. Jtpms conta in ed in Tool Eqnipment TE- 113 arc ·li st·ecl in Department of th e A nn .' ' S npply )LtiiLml SJG G 'l'E- 1Ll

rt. T ool . 1 Tool Equipmen t TE- J 13.

u. 1ll ate1'ials Orange stick (627:360) . C heesecloth, blea ·heel, l int - free ( G~ I D8D) . Cm.·bon tetmch 1 or ide ( 6G I, '~ ) . Clean ·ing contp0 11n d (GG2oG. 2). Paper , sancl , fl i 11 t }\o. 0000 ( (i/:7 !5 00- 0000).

Section II. PREVENTIVE MAINTENANCE SERVICES

26. Definition of Preventive Maintenance Preve11t ive maintenance is work pedonned on

equipment (usuall y wh en th e equ ip ment is not in 11 se) to keep it in good working order so that break- lmvn: and needless intenur t.ion: in service will be kept to !L min imum . P reven t ive mainte­Jlan ce di fler · from tr oublesbooti ng :mel repttil· s ince its object is to prevent certa in tr oubles from o · ·m·1·i1w. H.efer to AR 750-5 .

27. General Preventive Maintenance Tech­niques

a. U:e No. 0000 sandpaper to r entove cono: ion. b. Use rt clean, dry , J in t- h ee cloth or a d ry brush

for ·l ea11 in g .

18

(1) H necess:1ry, except for electri cal con­tacts, moi sten the cloth or bru sh with cleaning con1p011JlCl ; tl1 ml \Yipe the part: dry with <t clot·h.

(2) Clean elect ri cal ·on btets "·it-lt a. cloth moistened with carbon t·etrachloricle; tl1 en wipe t hem clry wil·h a clry cloth.

Caution: R epeat·cd conLnd of carbon letru ch loricle wi th th e skin o1· prolonged breath ing of the fum e. is clano·erous. Make sure aclcq ua te ven t i 1 n tion is p l·o­vided.

c. If ttv<t il nb le, dry compre:scd a ir llHLY be u eel at a line pressure not exceedin g GO poun ls p er sq uar e inch to r emove clu.t Jrom ina ccess ible pla ·es; be careful , l1owever, or nwclmni cal dama ge Crom the air blast l1l <l.)' r esHlt.

d. F or furt·hc r inform a t ion 0 11 preventi ve main ­tenan ce t·cch niques, 1·e:l'e r lo TB SlG l78.

28. Use of Preventive Maintenance Forms (fi gs. 15 and Hi) .

a. The clec i: ion as to whi ch iLcms on D \_ Forms 11- 2;)8 and 11 - 230 nrc npplical> le t·o tl1i s qu ip­menti s a ta ct ica l decision to be mndc in the en. e of f-irst echelon maintenance by th e <;:omnnmi cat ion oflicer /chi ef or hi s cl es ig nutccl representat ive, n ncl in case of second ancl third echelon mn.in tenan ee, by th e i ncl i riclual making the in spect ion. In -

OPERATOR FIRST ECHELON MAINTENANCE CHECK LIST FOR SIGNAL CORPS EQUIPMENT RADIO COHHUM I CAT! OM, DIRECTION FINDING, CARRIER, RADAR

I NSTRUCTIONS: See other aide

EQU I P~E NT NOWENC LATURE EOU I P• ENT SERI AL NO.

LEGEND FOR HARKING CONDI TIONS: .{ Sat is f ac t ory; X Adju s tme nt, r epai r or repl aceme nt re qui r ed; ® De t ect co rrec t ed.

NOTE : St ri ke out i tems no t appli c ab l e .

DAILY

COND IT ION NO IT EM s • T ·w T F s

Q. IJ COMPLETEN ESS AND GENERA L COND ITI ON OF EQU I PMEN T ( r ece i ve r, tran am itt e r , carry l n~ ca a ~~ta , •lr e a nd c a b l e ,

"'i c r oph one a, tube a, 11 p1tr e par t •, t ec hnic al m lJnu ~ / 11 and acceaa ori e a ) . PAR . 29 0 (I)

2 LOC AT ION ANO INSTA LL ATION SU ITAB LE FOR NOR . AL OPERATI ON.

a. CLEAN DI RT AND MOISTURE FROM ANTENNA, MICROPHONE , HEADSETS , CHESTSETS, KEYS , JACKS , PLUG S, TE LEPHONES ,

CARRY I NG BAGS , COMPONENT PANE LS. PAR . 29 0 (3) .... (:!. IN SPECT SEATING OF READ ILY ACCESS IBLE " PLUCK-OUT" I TE l-I S: TUBES, LAMPS, CR YSTALS, fUSES , CONNEC TORS,

VIBRA TORS , PLUG- IN CO ILS ANO RES ISTORS. PAR. 29a (4) .. I G. INS PEC T CONTROLS FOR BIND ING, SCRAP ING , EXCESS IVE LOOSENESS , WOR N OR CH I PPED GEARS , loi!SA LI GN~ E N T, POS ITIVE

ACT ION . PAR. 29 b (2)

IQ. CHECK FOR NOR•Al OPERAT ION. PAR. 29 a (2) WEEKLY '

NO. ITEM ~! NO ITEM ~~ z e .. (.;;

ClEAN AND T IGHTEN EX TERI OR OF COWPOHENTS AND CAS£5 , RACK 13

MOUNTS, SHOCK MOUNTS, ANT ENN A MOUN TS, COAX I AL TRAHS t.ti SS I ON INSPECT STORAGE BATTER I ES FOR DIRT , LOOSE TERio41NALS , ELEC-

LIN ES , WAV E GUIDE S, AND 'C ABLE CONNECT IONS. TROLYTE LEVEL AND SPECIFIC GRAV I TY , A NO OAWAG EO CASES,

PAR . 29o (10) 8 l.•

INSPECT CASES, WOUNT I NGS , ANTENNA S, TOWERS , AN D EX POSED CLEAN AIR F ILTERS, BRASS NA ioi E PLATES, D tAL AND li!ETER WETAL SUR FACES , FOR RUS T, COOROS I OH , AND WOISTURE . WINOOWS , JEWEL ASSE • BLI ES.

l<i 15

INSPECT CORD, CABLE, WI RE , AND SHOC K WOUN TS FOR CUTS, ..... BRE AKS , FRAY ING, DETER I OR ATI ON, KIN KS , AN D STRA IN . INSPEC T • ETERS FOR OA • AGED GLASS ANO CASES .

PAR. 29b (4) AND 29b (5) PAR. 290 (2)

10 16

IN SPECT ANTENNA FOR ECC ENTRI CITIE S, CORR OS I ON, LOOSE FIT, INSPECT SHE LTERS AND COVERS FOR AOEQUACY OF WEATHER -OA• AGED INSULATORS ANO REF LECTORS. PROOFI NG.

11 17

I HS PE CT r AN VAS IT EWS, TE AR S, AND FRA YING.

LEATH ER , AND CAB LI NG FOR WI LOE W, CHECK ANTENNA GUY WIRES FOR LOOSENE SS AND PROPER TENS ION .

I~ IN SPECT FOR LOOS ENE SS OF ACCESS IBLE ITE•S: SWIT CHES , 18

KN OBS , J ACKS, CONNECTORS , ELECTRI CAL TR ANSFOR WERS, POWER- CHECK TER.IN AL BOX COVERS FOR CRACKS , LEAKS , DAMAGED STATS , RELAY S, SELSY NS, WOTORS , BLOWERS , CA PACIT ORS , GEN- GASKETS , DIRT AND GREASE. ER AT ORS , AND PI LOT LIGHT ASSE • BLIES . · PAR.29c (9)

19 IF OEF ICIENCIES NOTED ARE NOT CORRECTED OUR ING INSPECTI ON, I ND I CATE ACT I ON TAKEN FOR CORRECT I ON .

qEPLACES DA AG O FOR • 419 , 1 DEC 50 , WH I CH I S OBSO LETE .

TM 5101-24

Ji'i{JIWe 15. D A l~onn 11-ZJS.

19

20

SECOND AND THIRD ECHELON MAINTENANCE CHECK LI ST FOR SIGNAL CORPS E QUIPI~E NT RADIO COHHU. IC ATIOM, DIRECTIOM FIMDIMG, CARRIER, llAOAR

I NST6UCT1 0NS: See other • Ide

EQU I I'WENT N~EHCLATURE EQU I PW( NT SERIAL NO.

LBGBND FOR MARliNG CONDITIONS: .f Satisfactor7; I Adju9trneot, r epai r or replacemen t r e qu i r ed; <!) Defect co r rected •

NOTB : St rik e oot lt eiT'IB not appli c able .

HO ITEH

~~ COMPlETENESS AND GEN ERAL CONDITI ON OF EQUIPN(NT (recelu r, t r an••ittc r , ce rrylt~i c UGIII, •ire e nd c able, •icrophoroe e , tubee, epiJr e per le, hchnlca l •enuel; 111 nd ecc c .u oriu),

PAR . 29 a (I)

LOCATION AND INSTALLATIOU SU ITAOL( FOR HORNH OPERAT I ON.

1\l CLEAN DI RT AN D ~t O I ST UR[ ri~O N ANT(~NA, WI CRO Pt!Ot/ [ 1 HE ADSETS, C11E STS£TS, KEY S, .JAC KS, rt U!iS , TEt!I'HONE S, CARRY l NG 6AGS 1

cowPoNENT PANELs . PAR . 29a (3}

1\!:_[:/INSPECT SE AT lNG OF READ 1l Y ACCESS I Bl£ ~ P LUCK- OUT" IT EWS: TUBES, l Aioi ?S , CRYSTALS, FUSE:S , COUNECTORS1 VI SRA'r ORS 1

PLUG- IN COILS AtiO RH I ~ TORS . PAR. 29a (4)

I~ CHECK FOR NOR NAL OP(RATI OH.

PAR. 29 a (2)

~~ CLEAN AND T IG11TEN EXH~ lOR OF CO~otPQ II(NTS AND CASES , RACK ltOIJNT S , Sti OCI'. IIOUIITS , ANTOINA MUU NTS, COAXIA L TRAN SMI SS ION LI NE S, w~o. vr. uurors . AND c:.c Lr co~wrcr roNp·A R.

2 9 0 (I O)

1..!

10

ll

I HSP£CT OS£5, )II QUNTINGS , AIITE NNAS, TOWERS , AND EX POSED lt E'TA l SURFACES , FOR RUS T, CORROS IOU, ArlO WOISTURE.

INSPECT CORD, CA!IL(, WI R[, AtlO SHOC K ~C OUNT S FOR CUTS, BREAKS, FRAY lNG, DETER IOOAT ION, KIU KS , AND STRAIN .

PAR. 29b (4) AND 2 9b (5)

INSPECT ANTENNA FOR ECC OHR ICITIE S, COiiROS IOU, LOOS E FIT 1

DAMAGED INSUlATORS AND REFLECTORS .

INS PECT CANV AS ITE ioiS, l EATH ER , AND CABLING FOO MILDE W, TEARS , AND FRAYING.

l2 u INSPECT FOR LO OS EN ESS OF ACCESS IBLE ITE MS : SWITCII ES , KN OBS, t- .JACKS, CONNECT OR S, rtEC TRICAL TRANHORwERS , PO• f.RS HT S ,

RELAYS , SELSYN S, wOTORS , BLOWERS , CAPACIT ORS , GE NERAT ORS ,

1)

16

11

18

AND PILOT LIGHT A ss r~o~ s u rs . • PAR . 29a (9)

INSPECT STORAG E 8.1.TTER I CS FOR DIRT, l COS £ TERiotiNA.LS, ElE CTRO LYTE LE VE L AND SPEC IFIC GR AV ITY, AND OAI.IA G£ 0 CASES .

CLE AN AIR Fl LT ERS , BR ASS UA!ol ( PlATES , DIAL AIID io4EHR WINDOWS , .J(W(l ASS Eto~ S liES,

IHSPECT M(HRS FOR DA~o~AG£0 Gt.J,SS AND CASES.

PAR . 29a (2)

INSPECT SHELTERS AND COVERS FOfl AD£0UAC Y OF 'II EATHERPROOF IHG.

CKECK ANT(NNA GUY WIRES FOR LOOS ENE SS AND PROPER T(NS I ON ,

CHECK T(RMINAL SOX COVERS FOR CRACKS , LEAKS, OAWAG(O GASKETS , DIRT AND GRE ASE.

e> HO. 0

20

" 2)

21

)0

)1

) 2

IT EH

ELECHION TUe(S - IUSP[CT FOR l OOSC [NV[LOPES , CAP CONNEC­TORS , CR AC!IEO SOCrH$ : INSUFF ICIEIIT SOCKET SPR ING HNS IONJ CLEAN DUS T AND 0 IR T CAREFUll Y; CHECK [ ~I SS ION OF R£C( IV[R

TY PE rum . PAR. 29 a ( 7 ) - r---IN SPECT F l LW CIJT - OUTS FOR LOOSC PARTS , 0 IRT, to~I S ALI UUN[ NT AND COM OS ION .

IN SPECT F IX(O CAPAC I TORS FOR LE.I.KS, BULGLS , A liD 0 ISCO LORA­

TION. PAR. 29b (3)

IH SPECT R£t.J,Y AHD CIR CUIT BRE AKER USCiot!H lES FO$! LOOSE to~ OU NTHtGS ; OUR I<I EO , PITTED , CORRODED CCN f( '. TS; ICI S A LIG "'to~ E I<IT OF CO NTACTS AN D SPol iNGS; INSUFf tCI(t,T ~f;• 11.\i T(NS 10"'; DU;D ­ING OF PLUNGERS MoO 111Nj( PARTS .

IN SPECT ~ A R I All LE CAPAC 1T ORS FOR. 0 IRT, 140 I STURE , WI SA LI GN ­YENT OF Pt.J, TES , .l.!tD LOOSE WOUitT INGS .

IN SPECT RES ISTO'IS , 8U5 1iWGS , AND IUSUI.J, TORS , FOR CR AC KS , C111 PP UtG , BL ISTER IIIG, DIS CO LORAT ION A~O WOISTURE .

PAR . 29 b (I)

INSP£C T T(ll i.! IIIALS Of t.J,RG£ F IXED CAPAC I TORS AND RES ISTORS FOR COUOSiOU, Ot iH AND LOOSE CONTACTS . PAR.

29b (S)

CL(A N AND TIGHE <j S'MI TCt.[S , T!:R WI NA L etOC KS , II LO'If (RS , REL AY CA~f:S , MtO INTOIIORS OF CIIASS IS At<O CABINET S NOT READILY ACCESS IBLE . PAR . 29b (2)

INSPECT T(R I.IINAL IHOCKS FOR LDCS( CDNIOECT ION S, CRA CKS AIIDD REAKS .

CHEC K S(iT IN GS OF J.OJUSTAIIl( R[LA YS .

LU5R ICAT ( E~U t i' W l/IT Ill ACCORD AN CE WIT H APPLICAB LE OEPART iot EtH 0."' THE AR\I.Y LiltlR ICATI OH ORDER .

PAR .29b (6 )

n.ISPECT GENER AT ORS , A~o~ PU O YN!:S , DYNAMOTORS , FOR BRUSH WEAR, S PRI NG TE NS I ON, ARCI NG, AND F ITTIUG OF CO~ ~UTATOR .

CLEAN AND T! GHT(N CO NN ECT I O'>S AN D MOU NT INGS FOR TRANSFOR II!RS C110 KE S, POTE Nfi014 [T(RS , AI< D RHEOS TATS.

t'-' INSPECT l RAHS F QR ~o~fRS , CHOK ES , PDTEt<TI O to~ E T ERS , AND RHEOSTAT S FQ.'I: O't' ER11EATIHG AND OI L-LEAKAGE. •

PAR . 29 a(5) AND 29b(6) ))

BEFORE SH I PP ING Oil STOR IN,j - REI·IOYE BATTER IES .

INSPECT CATHODE RAY TUBES FOR BURNT SC REEN SPOTS.

) 5

INSPECT OATIERI( S FOR SHOR TS AND DEAD CEllS.

)6 INSPECT FOR LEAKING WA TERPROOF GASKETS , WOR N OR LOOS E PARTS,

)1 WOISTIJREANOF UNGIPROOF .

)8 IF DEFIC I ENCIE S NOTCO ARE NOT CORRECTED DUR I N~ IN SPECT ION , IND ICATE ACT ION TAKEN FOR CORRECT ION .

REPLACES OA AGO FORM IH9, 1 DEC 50, WHI CH I S OS SOL LTE ·

TM 5 101-2 5

F'ig1we 1G. D A. Form 1.1-.!89.

:-;Lnt ·t ions fo r Lhe use of each fo rm nppcar on the rcw1·se si<le of the form .

b. Circled item.· :inligure: 15 and lG are pn rhally or totally np pl icable Lo .\.F Ampli fier .AlV[­+65/ FH. Heferencc's in the lTE~I block refer to pn rag rap hs in text th n t con! a in n<ld it· ion a 1 lll flinte­JHI .Jl ce informa tion.

29. Performing Preventive M aintenance

Caution : T igh ten sc1·ews, holt s, and m1ts cnre­ful ly. F itting. Ligh tened beyo ncl the p ressure for wh icl 1 llH'Y are desig ned 1ri ll he broken or cla m­aged. ])isco nnect a ll po\H'r bd01·e perform ino· the Jollowing ope1·ntions. Upon complet ion , r c ·o nn ecL power nncl check for satisfa ctory opC' rat·ion.

a. E xt 1·io1' I tems. ("I ) Che k :1'01 · con1pl e!'e nC'ss an cl sahsfacto1·y

cond ition of Lhc an1pliri rr. (:n (' heck mete r readi ngs (pa r. 2J nnd 22)

fo r Jlornwl ope ration. (3) Clea n exteri or of chassis ancl <1 Cces:ible

pnrt·s.

(-I·) Jnspect (il tm· capacit ors C2, Cfl, ClO, and CJ 1 for lea lmge of dielec tri c, fo r bulg­ing, and for hea!·in g (fig. !5 ).

(i5) I nspect po1re1· t-r:msfo1·nwr T3 fo r exccs­: ive l1 eati ng (fig. 5).

(G) ]n s,pecl Ju:e F l an cl f u: e holder for cor ­J·osion, cracks, and lack of tension sufft­cient lo insnre good contact.

(7) Check Yn cuum lubes, 1·eplace if necessary (Jig. 5) .

(8) InspC'ct capa citors Cl, G±, 6, and 7 for leakage of oil (fig. 5) .

(0) Check tube and filt er apacitor sockets and r in. :f'or loose onlncls, di r t, and col·­l'OSJon.

(10) ChC'ck input and milput plugs nnd 1·e­ceptacle: J 1 and J ~ for <I irt, corrosion, nn cl loose contacts ( fig . :'5) .

b. I nteriot' I tems.

Caution: D isconnect nll power befo re pedonn­ing t·he Jollowing operations. U pon completion, 1·econ necL power and check :f'or sa Lisf:tcto ry opera­Lion.

( J) Check resistors :for b listeri ng, di :colora-1 ion, an d other eYicle nee of overheating (fig. 2-~ ).

(2) Check swi1·ches I and S~ for d ir t, con·o­. ion, loose contacts, and sat.isfn ctory me­chn n ica l action ( fig. 2-1:).

(3) C'he k all t·he fixed ca,pacitors beneath ch:t ss i: for bulp·es and eli . coloration (.Ag. 2-1:).

U) Check " ·ire., co rds, nncl cnbles for cracked, cut, ancl fr nyecl in sula tion.

(5) Check te1·minal bourcls (TB1 and TB~) for Cl'acks, dirt, and loose connections (fig. 24).

(G) Check dua,l potentiometer Rl (~\. and B) fm · saii . JacLory electri ca l and mechanical open1 ti on ( fi o·. 2-1:) .

Section Ill. LUBRICATION AND WEATHERPROOFING

30. Lubrication of Dual Potentiometer Rl !VA Control!

a. Be : ure that lubrica.nt.s allCL po int s to be lu bri­cni·ed. on Rl ar e clen,n nnd :free f rom sand, grit, 01· cli r t. Bdore lubr ication, lean n.ll surfa ce: to he I tlbri cated.

b. Do not use exces: ive amount: of oil and clo not all o'" onn ections to become g reasy.

c. Pres. the catch near C'st the 1·ear en<l of Rl (r io·. 17 ) Lul'll Lhe rea r end cove r sufli ciently to J'C­

lPase i t, and pull t lH) cover o rr RL Clean ex posetl l'Cftl ' secti on contncL: ns instructed in a. aboYe with n. Ji ghL oil nncl r ota.te t.he sh n:f't. H Hll J' clark strenk ap pea r, wipe ofl' the ·ont.a ·ts \Yi1h a lint­f re .'Jot.h ; and rep at thi s procedure until the c ntn.cts a.re clean, then apply a thin film of light

oi l. Press the ca.tch nea.rest the hont o-f Rl ancl remo1·e t he rear, ection expo:ing the Jront section COll tacts. lenn th e conta cts in the ame man­ner. H.C'place the r ea r section and the end cover nncl lock in place.

31 . Weatherproofing

a. Oenet'al. Sio·nnl Co rps equipment, \Vhen opC' ra!·ccl lJn cler . enre climati c conditions su h. as prevai l in LI'Op ic, Drctic: ; nncl clc, ert r egion:, re­qni res special t l'en.tmcnt and maintenan ce. Fun­gus gro\\'th, insects, dust, cono ion, salt spray, ex ·essive moistm e nncl extreme i·emperature nre harmfu l I o most m<lter ia ls.

b. Tropical Main tenance. _\. spccinl moi tu re­ancl Jun 2: ip roofing t reatn1ent has been cl eYi se<l

21

TM 5101-14

Ji''ionre 17', Lnlwication ]JO'ints.

which, if properly applied, provides a reasonnl>le degree of protection. This treatment is fully ex­plained in TB SIG 13 and TB SIG 72.

c. A1·ctic iJ! aintenance. Special precautions necessary to prevent poor performance Ol' total op­erational failure of equipment in extremely low temperatures are fully explained in TB SIG 66 and TB SIG 219.

d. Desm·t Jlfaintm'-Lance . Special precnnt io11S necessary to prevent equipment failure in areas subject to extremel)~ high temperatures, low hu­midity, and excessive sand and dust are fully ex­plained in TB SIG 75.

e. Lu73rication. The effects of extreme cold and heat on materials ftndlubricants are explained in TB SIG 69. Observe all precautions outlined in TB SIG 69 and pa.y.strict attention to all lubrica­tion orders when opern,ting equipment under con - , ditions of extreme cold or heat. l~efer to para­graph 30 for detailed instructions.

22

32. , Rustproofing and Painting a. vVhen the finish on the chassi. and the trans­

formers (input, output, and power) have been badly scarred or dama.ged, Tust and corrosion can be prevented by touching up bared surfaces. Use No. 00 or No. 000 sandpaper to clean the surface down to the bare metal; obtain a bright smooth finish.

Caution: Do not use steel wool. Minute parti­cles frequently enter underneath the chassis of the amplifier and cause harmful internal shorting or grounding of circuits.

b. vVhen a touch-up job is necessary, apply paint with a small brush. Remove rust from the chassis · or transformers by cleaning corroded metal 'vith cleaning compound. In severe cases it may be necessary to use cleaning compound to soften the rust and to use sttndpaper to complete the prepara­tion for painting. Paint used will be authorizec! and consistent with existing regulations.

!

l

Section IV. TROUBLESHOOTING AT ORGANIZATIONAL MAINTENANCE LEVEL

33. General Troubleshooting Procedu! es

a. The troubleshooting and r;epair work that can be . performed at the orgari.izational mainte­nance level (operators and repairmen) is neces­sarily limited in scope by the tools, test equipment, and replaceable parts issued, and by the existing t.actical situation. Accordingly, troubleshooting is based on the performance of the equipment and the.use of the senses in determining such troubles as burned-out tubes, cracked insulators, etc.

b. Paragraphs 34 through 36 help in determin­ing which of the circuit<; is at fault and in local­izing the fault to the defective stage or item, such as a burned-out tube or fuse.

34. Visual Inspection

a. Failure of this equipmen,t to operate properly usually will be caused by one or more of the fol­lowing faults :

(1) Burned-out fuse. (2) \'Vires broken because of excessive vibra­

tion. (3) Defective tubes. ( 4) ·worn, broken, or disconnected cords or

plug. ( 5) Leaky or bulged filter capacitors. ( 6) Burned or discolored resistors.

b. vVhen :failure is encountered and the cause is not immedia.tely apparent, check as many of the above items as is practicable before starting a detailed examination of the component parts of the system. If possible, obtain information from the operator of the equipment regarding perform­ance at the time trouble occurred.

c. Inspect the input lead-in and circuit for obvious abnormalities.

35. Troubleshooting by Using Equipment Performance Checklist

a. General. The equipment performance check­Jist (par. 36) will help the operator to locate trouble in the equipment. The list gives the items to be checked, the conditions under which the item is checked, the normal indications and tolerances of correct operation, and the corrective measures the operator can take. T o ~tse this list, follow the iterns in nurnm-ical seq~tence.

b. A ction or Condition. For some items, the information given in the action or condition column consists of various switch and control settings under which the item is to be checked. For other items it represents an action that must be taken to check the normal indication given in the normal indications column.

c. N or1nal Indications. The normal indications li sted include the visible and audible signs that the operator should perceive when he checks the items. If the indications are not normal, the operator should apply the recommended corrective meas­ures.

d. 0 orrective ill eas~tns . The corrective meas­ures listed are those the op"erator can make with­out turning in the equipment for repairs. A reference to the troubleshooting chart (par. 49) indicates that the trouble cannot be corrected during operation and that troubleshooting by an experienced repairman is necessary. If the set is completely inoperative or if the recommended cor­rective measures do not yield results, troubleshoot­ing is necessary. Ho'\vever, if the tactical situa­tion requires that communication be maintained nnd if the set is not completely inoperative, the operator must maintain the set in operation as long as it is possible to do so.

23

/

36. Equipment Performance -Checklist --,---

Jtt'fll No. l tt.'lll .:\cl ion Or CO lid iLiOII

'?-< ~~ 1 InpnL receptacle __ Plu g inl o input Plug .J I . .::'o ..... 2 Oulput recrplaclc· _ _ ]0 lll g in lo onLpu t Plu g .) 2.

~~ I ~-· --- - - ------·-----·

p... 0 E-< w

:3 OFF-0::'\ s11·iteh __

,I METER s\\·itrh _

' Thro,,· to 0:-\ pos itio11

Check each t ube a~ de­sc ri bed in paragraph 2:l.

5 VA coni rol ----- _ _1 Check\' A eonLrol

G H U >I " "' •ol ___ J Cheek llU ;t "'"coL __

7 OFF-O N swiLch __ T hrow to OFli' posil ion

_ _'_ _ __: _________ __ - ----

24

..t\!O I'III fl i indit"H ti fJ II S

j\] cter read ~

each L11be. \ ' Olt fOI'

C:ain of amp lifi er should in ereasr as <;O n I ro l is lill'll ed in clockw ise cl i­rcet ion .

IJ um r ed11 ce cl l o Jni ni­mum by adj usllHC iil of ltulll onlrol.

C'ol'l'(•ttin• IIJt'nsun·s

Jf one lube reads bel ,,. I

vo ll , rPpl ace defect i H'

tube. If all lubes rrad below I ,·ol(, , rr pln.~;e

5Y:!C:T or plug- in fill er ca pa~;ilors .

Refer Lo paragraph -IU.

Refer l o par:l l!; raph -I!J.

5Y:.lC:T L111Je heate r goes I f sL ill on, eheck O I"Jo'-ON 0 111 . swileh. Refer l o para­

graph ~D.

CHAPTER 4

THEORY

37. Block Diagram (fio· . 18)

AF Am p 'l .ifim· AM-"J.G5/ FR i. · <L 'four-tube h igh fidr li ty, high g<tin, low cl ist·orhon a mplif ier de­sig ned Lo r n i.e the 011 tpnt level of p1·en.mp 1 i (i ers Ol' m ixers to <t level su itable fo r feed ing broaden. t Lelrpll oJle lines or ~1.11 d i o 1Tansmitter inputs. T he s ig nnl path itncl block diagram an~ sho\\;n in fig ure 1 . A compl ete schematic cl iflgnun is shown in fig m·e 27.

a. lnJYut Tmn.sfo1'1ner. T he n11 cl io sig nitl from the mixer ;mel / or pren.mpl i(ie r i.· feel in to inp ut Lra nsfonn er T J.. T he input t ran: former can be co nnected for 600-ohm bn lanced input, 600-olu11 Hn bn.ln.nced inp11 t, 150-ohm b;tl n need in] ut, 150-ohm unba lnn cecl input, or b<t lan eel bridge in p ut ( pnr. 17) .

b. Fi1' ·t lf lmzJlifle7'. The fir st af amplifier uses a pen tocJe tube that ampli fies th e outp ut of the input t ransfo rmer (T1). The output is con­pled to the inp ut of secon l af ampli fier (V2).

c. 1 econd Af Amplifie1'. T he second af a mpli -

INPUT 1ST 2 D

~ r;--TRANSFORMER AF AMPL AF AMPL

OUTPUT Tl VI V2 OF MIXER I I

I I AND/OR

I I t PREAMPL I Rl DUAL I 1...-POTENTIOMETER-1

'f1cr Lves a pentode tube t hat amplifi es the outp nt of the first af amplifier (V1) to a level sufficient to dr ive the I o'vcr ampli fier. A 11cgative :feed­back voltage is f eel to the cathode hom the ou tput tl ·an. fo rmer . This improYes . tage stability an l rechtccs stage eli. tortion.

ct. Af Outp~~t Ampli{ie1'. ~\.f output nmpl i fier V3 is a conven t ional power amplifier tha.t ampli­fi es th e output of the . econcl Rf amplifi er. The a udio outp ut o:f the a:f output amplifier i fed to outp nt tmnsfo1·mer T2. The econdary of the outp ut trans:fOl'mer is tapped to p rovide impecl­nltce outputs of 5, 7.5, 15, 150, n,ncl GOO ohms. A Ler t iary \l'inding in the p1·im~try of the output tra nsfo rm er proY icle.- the fee lback sign al to the second af amplifier (V2) .

e. Po1ve1· 8 ttJJJJly. P o,rer transformer T 3 I ro­vicles a .filament voltag o:f 6.3 volts for amplifier tube V1, V2, and V3. It also provides the proper voltaO'e (5 volts) for the operation of plate supply rectiftel· (V4) filament and ac Yoltage for the plates o:f the plate, upply rectifier (V4) . P late supply

AF

1+- OUTPUT f+-AMPL V3

FEEDBACK NETWORK

OUTPUT

TRAN SFORMER

T2

t

;:=:: f-'--

~

5 -OHM} 7.5 - OHM 15 -OHM OUTPUT 150-0HM 600- 0HM

TO FILAMENT S OF VI, V2 AND V3

INPUT 100-130V 50-60 'V

R6 ~ CONTROL

POWER

'-.V'--..--, TRANSFORMER S l Fl

115V I AMP

T3

PLATE SUPPLY

RECTIFIER V4

8+ OUTPU T TO PLATES OF VI, V2 AND V 3

l •'ig11re 18. ill •' Ampli(i r iJ.Jli- 1,65/F'R, tnnctional block diagram.

TM 51 01-15

25

rectifier V4 uses a duodiode tube as a conventional l'ull-wave rectifier ci r cuit. The filtered de output of the rectifier supp 1 ies the lc p late and screen voltage for amp] i ri.er tubes V1, V2, and V3.

38. Input Circuit a. The input circuit consists of :input pluo· .Jl,

the b1:idging network, and input transformer T 1. Input plug J1 is wired at the factory as shown in the overall schematic (.fig. 27) . The input signal is fed to terminals 11 and 12 on Jl. The groun led side of the inpu t s io·nal is connected to termin al 11 on Jl.

b. Input transform er T1 is wired at the factory for 600-ohm balanced inpu t, as shown in tl1 e over­fLll schematic (fig. 27). Inr ut tnu1sformer TJ flll

be connected for GOO-ohm unbalanced input, 150-ohm balanced input, and 150-olun unbalan ced in­put, as described in paragraph 17.

c. When a balanced bridging input is used, th e input signal is fed to terminals 5 and G on input plug Jl. This feeds the input sig nal into the

1 balanced brido-e network, which consists of r e­s istors R23, R24, an l R25. Resistor R24 is r e­quired for the prima ry load ing of input trans­former Tl. Resi. tors R23 and R25 are used as isohLtion resistors. These resistors prevent any chn.nge in :line level from r.Lffecti ng the amplifier by isolating the amplifier from t he line it i: connected across. The output of the balanced bridge net­work is connected J·o terminals 7 and !) on input plng Jl. Refer to _panwrnph 17e :fo r compl ete

1ST A F AMPL VI

description of balan eel br idging input conne -t ions.

cl. Terminal 10 011 input plug .Tl is grounded. Terminal 8 on input plug Jl is connected 1o :METER switch 82. ·with a 20,000 ohms-per-volt voltmeter connected to terminals and10, ampli­fier t11bes V1, V2, and V3 can be checked by using M l~TBR switch 82 (par. J6) .

39. First Af Amplifier (fig. 1!))

a. The fir st a:f ampl ifi er Vl 11 · · a pentode Lube (ty pe GJ7). In ·omi ng sign:t ls Jrom the input 1TaJisformer develop a voHnge a Toss r . istor R1 \. , one-half of the dua l step n.LtenuaLor. The signal voltage :fed to the gri l of th i.- tube i: dependent on Lhe seLtino· of Lhe VA control . The resistor loads the seconcbry of the tmnsformer e ffectively , iso lrt t ing the inr ut i rcn it ·from the grid ci rcui t and controls the amount of s ignal applied to the amplifi er control grid. T he atnpl iriecl s igna.l cle­ve.lopecl in the plate of th e nmplifi er is coupled to the : econl a:f amplifier . Re.- .i s tor R:> and p}trallel comb ination C1 and R -1· fm·m the plate load. C:ttho<le bias forth iss! age is p1·ov i cled by R2G and R2. To in·1prove tl1 e freCJu ency response and stage sta iJili ty, these resisto rs a.r e left Hnbypas. eel . Resi. tor R2 in aclditio11 1o supplying <L portion of the bias is used as a me!·e l' shunt. The junction o:f R2G and R2 is wirecl to Ml£T8R s1vi tch 2. When f il e METER . witch is placed i.1 1 position 1, the vol tage clHeloped fwross R2 ca11 be mea : nred

SECONDARY OF Tl

6J7 TO ,--------~--·CAPACITOR

26

NOTE :

UNLESS OTHERWISE SHOWN, RESISTORS ARE IN OHMS , CAPACITORS ARE IN UF

R5 120K

R4 IBK

R22 5,600

R21 5,600

+325V

C4

li'iow·e 19. l•' ir.s t ill'' : l mpti(i er, scil enwt ic tliagram .

TM 5101-16

on llw sysLen1 mel·er (p:n. IG). H the stngc i.· opera( ing ll01"1 1lally, a, po(l'll( in] o f l volt wi ll be rP:Hl on Lhc system meter.

(). S ince co n1·l'ntional ampl if iers haYe an in ­lH' I"l' nL LE' 11< lency to amplify lh c milldl c range o-f n 11<l io fn:qucnc ics n1o 1·c than cil hl'r the hi gh or low h cqueneies, com pensHtion is nrcess <~ ry . Resistor H-~ Hnd ca pacitor O l :l'orn1 H low-freq 11 cncy com­pellsaLi ng network. ~U t·he .l ow fre(ju encirs, the outp 11 t volt<~ gc :fed to the next sl.nge is developed Hc: ross R !5 and H-L O<~pa cito r O l has H h igh J·e­actnncc at the low frequencies nncl hn. liu-l e effect on fil e ir·cu it. However, as t·he -freqnency in ­creHHCS th e 1·eacta nee of 0 1 decreases. This cle­creases the efl"cctiveness of R-1: a. pnxt of the plnte loH.d. There-fore, the output voHnge. rlel'elope l nt-. the h iglwr frequencies is de rensed. II igh-:fre­f!Ue nc-y eo111pen.·ntion is HCCOlllpli .-hecl in th next sl.ngc. Sho11 ld it be~o n1 e neces.-a ry to increH ·e the low-frequency response st ill f 111-ther, refer to pnra­gmph Hl.

r . Resistors JL2 <~nd R21 bypassed by 02A and C213 form the plate cl ecoupling iJ.etiYo rk. Re­si.-1-or B3 is the . creen ch opping res istor and ca­p <~ c. i l· or ('3 is the screen by pass c-:Lpacitor .

40. Second Af Amplifier (f-ig . 20)

a. T he second H:f voll<~ ge Hlll plif·ier Y-2 uses a ty pe (i .J 7 pentacle L11 be. T he ontp ut of the ii. rst n,f a 111 p l ifi er is co up led through capa citor 04: to the c-ontrol g ri lot V2. The signa.] voltao·e fed to the g-r icl of th is t ube depends on the, eLting of the VA co n! rol ( t ho secoucl h nH of the dun.l step nttenu­a.lo1·) . HiHs for the si·age is ])l"OI·icled by re ·istors H-7 a nd Htl . Be. istor RS i11 ndd ition to sup pl yi ng H port ion of the Lias p roY ides :L Lest ing point for t hi s shtge. T he j un ction o f H-7 nn d RS is con­nec l.ed t·o the :VIETER s iYi Lch. \Vhm1 the Mr~TER .-wi tch is in positio11 ~, <L r ea.d ing of 1 ,-ol t sho11l d be obtai ned on the system meter (par. IG).

u. T he fir. t nf ampli fiu \I"H S corn pensHl ed for losses Ht 1"1 10 lo\\·E'r encl of t he frequency ·pect-r um. T he seco r1 d af stage compen.-ntes for losse oc­Cill-rin g- at tl1 e h igher -f'rcq11 Cnc ies. ompensation is Hccom pli shed by n. feedback circuit thnt cl e­n easps t·he a.mount of nega.t ive feedba ck a the freq uency increases. Res isto rs B7 nnd BS are p:mtll eled by t·he seri es circui t of RD nncl C5, 'l

lo11·-f requency compensaLing n 'tll"ork. Th is com­hi na t ioH receives n, :feedback signal developed

ac1·oss the output transformer t0rtia ry winding. The feeclba ·k signal is feel fr01n t·he teJ:l inry wind­ing th rough ]imitinrr resistors Rl 5 and R16 to the cathode of V:2., .\.t lo11· s ignal frequencies, cnpn ' itor (':)offers co nsidemi>le rE' nctnnce; therc­f'ore, rc ·istor H.7 and B S form the efl'ect-ive imped­nnce of tl1e pan1llel circu it . H oiYE>Yer, as the ·ignal ·fre(j ii OII y il lCJ·oase.; the reac- ta nce of C!5 decreases :Ill d. I he C:> n:ncl RD COlli ui nat ion is effe ·tively p lncecl i1 1 pa rall el with R7 and R , thus reducing the p01·centage of ncgati n Jee clb<~ c k Hpplied to t he cath ode of Y2. The result of thi s high-fre­cpr ency compensation plu.- the lo\\·-frequency compensation network in the first af amplifier is a flnt frequency response oYer the ent-i re n.uclio range. ho ul cl it become necessary to f m ther increH:e the h igh-f requency r esponse, refer to pn 1 · <~gmph 10.

c. Resistor Rll i: the plat·e load res istor; the voHHge cleYelopecl across th is re i tor i fed to the po1rer ampli (i.er stage. Hesi.-tor HlO is the s r en voltage dropping r es i. tor and ca,pacitor C LO is the screen b)"l)il cn,pacitor.

41. Power Amplifier (fig. :Jl )

a. The sig nal fro m the .-econd nt nmpli (i.er V2 is appli ed to the g ri d of po11·er am pli fier V3 ( lrrough coupling capncito1· 0 7. T he stage uses a type 6LG beam -po1rer pentode. B ias for the stage i levelope l aero.-.- r es istors RU ancl Bl-:1-. These r es istors are tm u~·passed to sec ure n cl egeneratiYe bin .-, whi ch stab ilizes the stage and decreases fre(j uency cl i.tortion. In addition to supplying n, port ion of the bins, Bl-:1: a ·ts n a meter ·hunt J·esisl·or . T he 1·oltnge der eloped (1 volt) acros.­Hl-1: i . .- uppli ecl to th e.-ystemmeter (pnr. l6) when t-l1e METER switch is in position 3. Scr een grid roltnge is applied d irectly to the screen from the +270-volt nppl_r . Res istor Rl2 i. the grid rdur n resi. tor.

b. Ou tp11 t t ransfor mer T:.. ha s a dun l primary and n tapped .-ecoJIClnry. The tap] eel secondary proY icles a variety of impedance output that are wi red to the output plug as sho\\"n in fi g ure 27. The two feedba ck circuit connected from the out­put ITansfo n ne r to the cathode of the second nf amplif-ier provides t he foll o"·ing advantages : higher f iclPli ty , impro1·ecl. tabil ity, less harmonic, ampli t ude, freq uency and pha . e eli -tortion, and l<mer noise le1·el ratio. The princir al o:f the cir­c- 11i ts (par. -Wu) is to ta ke a portion of the output

27

20 AF AMPL V2

6J7

A F OUTPUT AMPL V3

6L6

cs 1,200 UUF

NOTE :

UNLESS OTHERWISE SHOWN, RESISTORS ARE IN OHMS, CAPACITORS ARE IN UF

TO PIN 5 AND 6 OF PLUG J2

28

AC POWER INPUT

100-130V 50-60'\;

RIO I MEG

+270V +325V

l •' igwr6 20. ,'e(·unfi af Ollrl i'Oif'C?' Ollltuil ampli /l cr .

NQTE :

PLATE SUPPLY RECTIFIER V4

5Y3GT

6.3 VOLT FILAMENT VOLTAGE

UNLESS OTHERWISE SHOWN, RESISTORS ARE IN OHMS, CAPACITORS ARE IN UF.

Rl7 600

Cl2 .0 1

7"'i iJII1'6 2 /. Power Sll1JJJlJJ , schematic cliar;nt?ll .

J2

R20 5,600

T3 TM 5101 ~ 17

™ 5 10 1- 18

Yoltage dcl'elopcd across the tertia ry IYindiJl"' o£ T2 ancl feed it back to t he cathode of V2. Capac­itor.· Cl3 ancl C14 form rL voltage divider neL,r01·k acros the primary of T2, Lhu enabling <1. portion of the Yoltage developed across th primary of T2 to be feel back to the cathode of V2. This Yoltage is 180° out of' pha. e with the tertiary winding feed­back voltrto· . The two sigmLi s oppose each othc1·, stabi lizing the impedance of the ter tiary winding nt ,000 cycle . Cn.pacit·o1· C8 is used to clecrense the impedance of' the feedback circuit aboYe ,000 c-ycles.

42. Power Supply (fig. 21)

TJ1e amplifier will ope m Le from nn a power source o:f 100 to 130 Yol ts, 50 to 60 cps. Foll ow the in;;tructions in p::u:aoTaph 19a for proper termina­l ion of the po,Yer tnm. former to the ac l inc.

rr. \Vith the ac voltage appli ed to terminal 5 nn l G of the output recep LacJe, the line volt age is connected to the prim ary of t r ansformer T3 tln·otwh te11ninn ls 5 and G of the ouLpttt pht f!', OX­OFF switch 1, and fuse FJ. The primary of T3 is tapped Lo permi t the 11 se of in put Yolt ages J·anging Jrom 105 to 125 volts.

b. The h.igh seconclnJ-y YolLao·e from taps T and 9 1s a,ppli ed to rectifier Lube V4. The rectifier u es a 5Y3GT tube as a conventional f ull-wave recti 11er that . upplies the de plate an l creen volt­ages for all the amplifying tube . _\. . ·ingle sec­tion pi-type ftlter, con isting of capacitors C9 and Cl O and l'l'Sistm· R17, suppl ies the ncces;;ar:· fi l­tering of the J·ectifiecl voltnge for the plat of the output tube. Resistors R18, R19, and R20 form the power . 'lipply voltage dividing nebYOJk The +350-Yo]t plate su,pply is obtained at the junction of R17 and R18; the +270-volt supply is obtained at the junction of R18 ;mel Rl9. Capa itor Cll i an additional fi l ter for the +270-volt uppl~· .

c. T he lo,Y-Yoltage seconda ry wind in gs of (Tan -formers T3 provides 6.3 volts for the filament of tl 10 ampli fier t ube. ancl5 volts for the fi lament of til e recti fier t nbe. Shunted across the 6.3- ,·olt fila­ment \Yincli ng of T3 is the II M control. _\.clju t­mcnt of l~G \ri ll keep each end of the filam:.'nt wind­ing at an equal voltage wiLh respect to the power Siippl y (1 ' Yoli s) ancl Lo uround, th u cancelling ;Lny a h um or ripple in the heater cir ui t of V1, V2, and V3. The ,possibility of heater to cathode electron em.is ·ion is eliminated by puttino· the heater at the +18 volt potential. Capacitor Cl2 provides aclcl ii'ionnl Alte r ing of the ac Alament supply.

29

CHAPTER 5

FIELD MAINTENANCE

Note. T his cilaplr r con l a ins i1 1fOrmn lion f or field main ten:u iC'r. 'r il e amoun t of' rr pair 111al can he perform cl by un i ls hav i ng fiel d mnin lenance r esponsihili ly i s l im il eLI on ly by llie too ls nnd tp,;l, eqn ipmr nt a1·n i labl e, and by the :ki ll of th reprt irma n.

Section I. TROUBLESHOOTING AT FIELD MAINTENANCE LEVEL

W arnin(J : Cer ta in point locr.J.tccl t hr?ughouL tl:c h :_L sis o-f the af amplifier op rn Lc n,t vo ltages above 250 v~lts . Do J:ot touch the:e pom ts wl:1~e pow_er ~ s ?cm o· appli ed to the a.m pli fi cr. l3c cal'e:ful when hancllmg or testmg f~ny p:ut of the mnpl 1 fter wh1lc 1 t 1s ·o1mectecl to t he powcl' source .

43. Troubleshooting Procedures

a. Geneml. The Jirst tep in erv.icing a cl efec­t i ve ampl ifier i. to . ectionalizc the fault. Sec­t.iomtli zation means tnt ino· the fn ul t to the major component or circuit responsible for the abnormal operation of tbe amplifi er. T he second step is to locnlizc the f au lt. Locali zation means trn,cing the f<LIIlt to the defective pcwt responsible for the ab­normal cond ition. Some fa. ul ts (such as burn ed­out J'CSi stors and shor ted Lm.n :-Eo rm ers) can be located by sight, smell, and hearing. The majority of fau lts h owever , mu st be local ized by check ing Yolh1ge ancl 1·esist<mcc.

b. Component Sectionaliaation and Localiza­tion. T he tests listed below a iel in isolating th som ce of trouble. T o be cf:f:e ·tive the procedure should be followed in Lhc or ler g iven. Remember Lhn t servicing pro ·eclm:e shoul d. ·ause no f urLher dama ge to the amplifier. F irst h ·o ub le sh01 1l d be 'local ized to a single circui t . Then the t roub le may be i. olatcd within that circuit by appropl'i<tte ,ro l ta ge-, t csi stance, rm cl con Li n u i ty m easuremcn ts. The crvice p rocedure is summ ar ized a follow. :

30

(1) Vis~tal in.spection. The purpose of visual inspection (par. 3'b) is to locate any vis­ible t rouble. T hrough this inspection alone, the repairman may f requently d is­cover the tr ouble, or letennin e the stag in which the trouble exists. Thi s in spec­t ion is va luable .in avoid ing ad l itiona.l damage to the am,pli fier th at migh t occur thtough improper servicing meth od. and in forestall inn· Jutlll'e fa ilu re:.

(Z) lnptd 1'e istance 1JWet8'W'ements. Th e lJJ cnsuremen (: (p il l'. -1-7) p revent f urther damao·e to the amp lifier f rom po sibl . hort ci1·cui ts. S in ce lhi s test gives an ind ication of lhe concli Lion of the filter circuits, its f unclion is more th an pre­Ycntive.

( i3) 0 pemtional te t. 'l'he op nd i onn 1 test (par. tb8) is importa nt ·bccn JJSe iL fre­q JJ ently indicates the o· n ral location of t rouble. In man y in ta nces the in fo r­nntion gai ned w ill cl (;e rmine th e cxad natlll'e of the h ul t . To usc thi info r­mation. :fully, a ll sympLoms 11111St be in­terpreted in relation to one :u10ther .

(-b) Trouble hooting chrtl't. T he trouble sym.ptoms list cl in t hi s hart (par. 40) will ai 1 g rea.tly .iu locn.liz.ing tro uble.

(r5) Signal s~tbstitvtion. The simpl icity of the amplifi c1· circuit docs not warran t the usc of the : ig nal subsLit ut ion metho I of troub leshooting . F:w lty component, :ectiona.li zat ion ancl. loca li zat ion i.· n.c­c:ompl islJcd. mo re qui ckly ancl ea: il y by taking the vol tage n.nd l'C istancc meas­m cments ( fi g. 22) an l by re ferrin g to the troubleshooLiJlg cht~rt (par. 49).

(G) l ntm'mittent . I n all Lh cse tests t he possibil ity of i nterm ittents. l1oulcl not be overlooked. If present, tb is type of trouble often ma.y be m t~cl e to f~PI ear by tappin g or janing the . et. It is I ossi­hl e Lhat the tro 1J ble i not in tl1e am-

0

3,000

NC

I .BV

800

72V

56 0K

ISTA F AMPL VI .

6J7

6 .3V AC, IBV

5,600

6 .3V AC,18V

5,600

65V

245 K

0

lOOK

NC

1.5V

1,360

48V

1.1 MEG

2 D AF AMPL V2

6J7

6.3V AC, 18V

5,600

90V

310K

AF OUTPU T AMPL V3

NC

0 470K

270V

87K

6 L6

6 .3V AC 18V

5,600

21V

6.3V AC, 18V

5,600

310V

90K

PLATE SUPPLY RE CTI Fl E R V4

5Y3GT .----NC

320V AC

150

NC

320V AC

150

'-----N C

NOTES :

I. ALL VOLTAGES ARE DC POSITIVE WITH RESPECT TO GROUND, EXCEPT AS OTHERWISE NOTED.

2 . 6.3V AC IS THE VOLTAGE MEASURED BETWEEN PINS 2 S. 7 O.N VI, V2 AND V3.

3. VALUES BELOW LINE ARE RESISTANCE MEASUREMENTS TO GROUND .

4 . NC INDICATES NO CONNECTION . 5. USE MULTI METER WITH SENSITIVITY

OF 20,000 OHMS - PER-VOLT DC , 1,000 OHMS-PER - VOLT AC .

6 . VA CONTROL Rl IN MAXIMUM CLOCKWISE POSITION .

TM 5101-19

Pi.gure 2.Z. ~l ' u b a sock et r olla {/ amlre ·i81anee diagram.

31

p l.ifier itself h 11 t in Lhe in.tal h~tion, or t h e t rouble may he ca used by external con­dition s. In this event, t est the in tall a­tion , if poss ible.

44. Troubleshooting Data Take ndvantage of the mn.tm ·i ttl sup pli ed in this

manual. H will help in the rapid location of fa nl ts.. Consult t h e foll owing t roublesh ooting 1latn, :

Fi~. Par. Drst·rip l i01 1

--- ------. j

(j

7

8 9

10

J I

12

13 18

22 23

27

I 5 1.5- 20

Ali' Am pli fi er Ai\ [- 465/FR, chass is, top view . Matchin p; in pn t connecLions on input trans­

form er T J. Balan ced br idgin g (npu t onn cct,ions 0 11

input receptacle for plug .n . Outpu t recept.aulc co nnections for p lu g J 2. N orm al frequency response of AF Amp li fir r

Ai\1- 465/ li' TI . F rcqu c n c~· response w ith high-f requ ency

compensat ion . F requency re~ po11 s \\' ilh low-frequenc~· co m­

pen: alion. P ar tial chc mal ic d iagram, show ing cha nges

for co mpe nsal ion. Frequ ency re~po n sc tesL scLup . Ali' Amplifi e r AM-·465/F R , fun ct iona l b loc k

d iagra m. Tube soc ke t v Hage a nd res i~ l.a n c di agram . A~' Amplifi er AM- '165/F R , D+ a nd fil am •nL

d isLribuLion d iagra m. Ali' Am pl ifi •r AM-,IG5/ Ji'R cha:s is, bo tto m

view. A.F Amplifi er Ai\l--165/ Ji'H, sehemal ic di a­

gram . T ec hnical cha racl erisl ics . Tn s la ll a t ion.

45 . . Test Equipment Required for Trouble­shooting

T he items of t est equip men t required Jol' t r on­blc:·hooting AF Ampli ficr AM-465/FR a re li sled below. T h e technical manua] associat ed w ith the t l'st equ ipmen t also are listed.

T est equipment

JGJcuLron Tube T es ter TV- 7/U or eq ua L MulLilll e l;e r T S- 352/ U _ D ecibel Meter ME- 22/P C M ________ _ \ T a ri a ble aLl" en uato r T S- 402/ U _ _ _ ___ _

32

TM J l - 5083. T M IJ.- 5527. T M 1 l - 20!J6. T M J J- 20,14.

46. General Precautions

'Wh enever the amr Wier i: ser vi ced , C;lrel l'.'S l'e­p'Ja c:erncnt of p n.rts often \Ti ll make new f n ults in cv itnble. Obsen e t h r foll o1Y in g prccnu l-.io tt .'.

a. Bc-fOl· c n. p:n t is un .·old er r J, no lc th e posi t ion of th e leads. H the pn ·t, suclt as a transform er , ha . <"~ num bE'r o·f conn ectio ns, 1 ng enclt of t he ·icllcls t·o it .

b. B e careful not to clamn.ge oLher leads by pulling or pushino· them out o:f the way.

c. Do not all ow drops of solder to f~tll into the set, since they may cause shor t cir cuit:.

d. A cm·eles. ly soldered conn e l ion m ay r eate n, n ew f mtl t. It is ve1·y imp01tant to make weJl ­.-ol dcr ed :joints, since a p oorly . ·older ed jo in t is on e of the m ost clifficu'lt :faults to fin d.

e. G ive par ticul a r atten tion to proper g roun d­ing when r e1l acing n, p a1t. U sc t he samr gr ound as in th e orig inal wiring.

47. Checking Filament and B+ Circuits for Shorts

( ri g. 23)

T ro tt hl P IY ilhin t he amp hfier often may be de­tedccl a nd a ldi tional tl·ouble avoided by eh eck­i ng th e r e.sis tance of the .fi lamen t nn d B + c ir­cui ts befor e applyin g power to th e equipmen t . M ake the foll owing checks befor e attempting to pu t Lhe ampli fier in opcr n,tion. ·w i th all the tubes r emoved the resistance between ground anl the -1- 325V poin t sho~tld r end approximately 95,000 ohm s, an 1 the resistnncc between gro un 1 ancl t lte -1- 270V p oint shoul d r ad apr r oxim a tely 87,000 ohms. \ iVi th the tubes (V1, V2, and V3 1·emoYed, Ute r es is tance of the ftlamen t winding (terminals 1 and 3 of transformer T 3) h ould r ead ap p r ox i­mately .1 ohm.

48 . Operational Test

\ V.i Lh th e ampl iCier conncc!t•d lo ih a:;socia led components for normal operat ion, operate the mn­p lifi er n: described in the equipment perform ance checkl i.t (pa1·. 36) . T h is checkl i ~ t is importnn t becau se it frequently ind icate · Llw g enel'a 1 :loca­t ion of t r ouble. A lso listen for erac:kling Ot'

buzzing noises t hat indicate vol tage arcing. Check th e amplifier :fm: smoke an 1 o lor of bmnecl o1· ovcrh ate 1 par ts.

NOTE :

100-130V 50-601"\.J

1ST AF AMPL V I

6J7

T3

UNLESS OTHERWISE SHOWN,

RESISTOR S ARE IN OHMS, CAPACITORS ARE IN UF.

F ioure :?.3.

R6 100

IHuMI

R5 120K

R4 18 K

20 AF AMPL V2

6 J 7

T~g _ro

2

7

Rl7 600

Rll 220K

CI2I .01_

V3

A ,,, Ll mpli{ter AM- 465/FR, JJ + and fila111 cnl cli sl r ib ul ion diagram .

PRIMARY OF

Cll 40

I

T2

TM 5101-26

33

I

Jl R25 Tl

J2 T3 TB I RIB Rl9 Rll T2

34

VI TB2 R3 R26 R5 R2 RS C4 R7 R9 V2

RIA

Cl

RIB

V3

Cl3

_!----'--All

----RIO

C6

C7

S2

Rl6

ca

R20 Cl2 Rl4 Cl4 Rl5 R6 V4 Rl2 ·F I Sl

TM 5101-20

•

49. Troubleshooting Chart

The Jollow.ing chart is supplied ns an aid in locating trouble in the amplifier and associated power supply. This chart li sts the symptoms that the repairman observes, either visually or audibly, while making a Jew simple tests. Once the trouble

has been localized to a stage or circtilt, a tube check and voltage ai1d resistance measurements oi' this stage or circuit should be sufficient to iso­late the dei'ective part. Normal voltage and re­sistance readings are given in figure 22. The location oJ the under chassi · components is shown in figure 24.

ymptom Probable trouble Correction

I. Rectifi er tube 5Y3GT Defective 5Y3GT _______ ____ ___ __ __ _ Check and replace 5Y3GT if defective. filamen t docs not li ght.

Defective switch SL __ ___ ___ : _______ _

Open fu se ___ - - --- - --- -- ---- -- ------Open power transformer T3 ____ ____ __ _

2. 5Y3GT plates : how red __ Shorted input fil te r capacitor C9 _____ _

3. 5Y3GT ove rh eats ______ _ Shorted outp ut filLer capacitor ClO ___ _

Shor ted plate filter capacitor CL _____ _

Shorted + 270v fil ter capacito r Cll ___ _

Shor ted capacitor C2r\ or C2B __ _____ _

'f. Hum _______ _____ ____ -_ H UM control RG _____ ____ __________ _ Open input filte r cg __ _____ _________ _ Ope n output filLer ClQ _______ ______ _ _

Loose shielding _______ __ _ · ______ _____ _ 5. Motor boating __ ______ -- Open fil te r Cl.O. Open decoupling ca-

pacitors C2A or C2J3.

Open grid or cathode ci rcu it _____ ____ _

Open capacitor bet,ree n plate, cath-ode, of scree n grid and ground .

6. No signal or weak signal _ Tubes ____________ ___ __ ___ __ _______ _ ! Coupling capacitor C-1 or C7 _________ _ VA co ntroL ___________ ____________ _

Check Sl with ohmmeter and replace if defective. Check continuity of fuse and replace if defective. Check T3 with ohmmeter (see par. 50 for ap-

propriate resistance values). If filam ent: of V 4 to ground checks as short cir­

cui t with ohmmeter; replace C9 . If B + voltage at jun ction of R17, and RIS,

check: zero, B + checks shorted with ohm­meter ; replace CIO.

If B+ voltage at junction of .H,J7 and 11.18 is low, plate voltage of VI is -zero ; replace Cl.

If + 270-volt terminal is low or ze ro, + 250 volts te rminal checks low wi th ohmmeter ; replace Cll .

If plate a l!Cl screen Yoltages are low junction of Rl7 and RIS reads 5,600 ohms or junction of R17 and R22 reads zero " ·ith an ohmmeter ; replace C2A and C2J3. .

Check R6 and replace if necessary . If B + voltage is low, replace C9. If B + voltage checks normal , check C:I O andre­

place, if nece. sary. Check all shi elding. If B + voltage is normal or fiuct 11 a te: with motor­

boat' beat's and sc ree n vol tage: check normal, check Cl 0, C2A, C2J3. Replace defective compon ent·.

Check all grid and cathode defect ive component.

Chec k all capacitors fr0111 cathode, and scree n gri d. CO illj) OilCilt.

ci rcuits. Replace ,;>,·< ,,. ..

ground to plate, Replace defective

Check tube. and replace defective tube. Check and replace C-1 or C7 if neces ary. Check VA control with oh mmeter. Replace if

necessary. Grid resistor H.l2 __ _______ _______ ____ Check Rl2 wi th ohmmeter. Replace if neces-

Fil ter resisto r 111'- -- --- ---- --- ------

Scree n bypass capacitor C3 or C6 __ __ _ Voltage divider resisto r RlS __ .. __ ___ _ _ Voltage divider resisto r Rl9 and filter

capacitor Cll . Open primary winding of output t rans-

former T2. ·

sary. l f J3 + is ~ero, check Rl7 with ohmmeter.

(Caution: Di charge filte r capacitor ·) . Re-place if necessary.

Check C3 or C6 and replace, if necessary. If B+ is zero, check IUS. Replace if necessary. If scree n voltage of V3 is ;,ero, check Rl9 and

Cll. Replace defective component. Check T2 with ohmmeter. Replace if necessary.

35

Sym ptom I -- Proba ble trouble ----------- -·

('OITI'Cl ion

7. J'oor 1onC' quality ______ _ Short-circuited or leaky coupling ea- Cheuk p late vo l !,age of VJ and \ ' 2, a11d t hPc k ('.J. pacitor C4 or C7. and C7. llcplacc defec-tive component.

[ neorrC'ct val ue of grid rcs is!,ors ______ _l Check TU and R1 2 n.cplacC' clefecli,·p cont-

8. Fading _ ---------- __ _

9. Distor!,i olt __

10. Osci llat io 11 _

ll. Amp l ification hig ht•r than normal.

Op0 n b_vpass cathode capac i !,o r C:) -- -1

I

Tubes __ _ -------- - --- - ----Coup ling capac i tor~ C4 and C/ ___ _

VA controL __ ---··---- - ----YoHage cliviclC'r n •s istors R l8, ll 19,

ll20. Tubes _____ ___ ---------fmpropcr bi as voltages ___ __ _

Cou pli ng capac i!,o r~ C·l· and C7 ------Capaci!,or 13 or C l -1 __ _ Opc11 vol t,age di,·idel· H 1.9 ---- - ­Op n output, filt,N capaci !,or C I Q_

l<'ecclbaek cir t 11i L

50. De Resistances of Transformers

poncnt. If t here is a large difl"rrcner bC'hi·C'<' II IIOnnal

plate and sere n voltage, cheek C'5. Ht•p la<·t• if neCC'SSar y.

Check t ubes and replace, if II CC<'~sar .1·. Cltcck C4, and C7 and replace, if II C'CC~~ary . Cheek JUA 1t11d lli.B and w•p lace, if ncccs~ary. Check n 1. 8, IU9, R20 and rC'p lace, if IICC('~sa r .\".

Ch0ck tubes and replace, if IIC'cessary . Check bias voltages and rl'pl aee dcfcd iw part. Chcck C4 and C7 and rep lace if nccessar r. Check C 13, C l ,l and 1·cplacc , if ncccs~an:. If V3 screen voltage is high, rcpl ac<· n t9. Check C I O and rc'placo, if ncrc·ssnr,·. Check C l 3, C l -1, C8, H 1.5 , and i llfi. ll t• placl'

defecti ve r o1nponPn1.

'rrnnsfurmct / ' l'erminnls Ohms

The de resistances of the tran : fonner 'rinclings in t.he nmp l i fier are Ji. ted below: T2 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ________ _ 8- 11 I

T l ___ _

T2

'l'ran srorrn rr '1\•ntJitHds Ohn1 s

------ - ---' 1 -~

J I- J2 J- 3 ·1- 6 7- 8

rJ;.J

3, 000 50

200 20

8- !) I 8- 10 1

'[:3 ---

8- 12 18 7- J2 38

10- H .')

.11 - H 5 12- 14 f)

4- 6 I 7-9 300 1- 8 1.50 8-9 1.-o 1- 3

Section II. REPAIRS

51 . Replacement of Parts a. Most of the parts in AF Amplifier A.M-465/

FR are readily accessible n.nd are easily rer laced if found to b faulty. If VA control RIA or RlB, METER switch (82), or OFF-ON swjtch Si re­quire replacement, carefully ma.l·k the wires con­nected to the control or switches with tugs or other device. to avoid misconnection when the ne\Y con­tl'ol or switch is in tall ed. FolJow thi s prnctice >vhenever replacement requi re: tlt e di sco nn ect ion of n11m erot1.' wires.

36

/1. To replace iJ1p11 t t runsfonn er T l, output transform er T2, or [)Ower transformer T3, m:u:k th e wjres conn ected to t he transformer ·ardully " ·i tl1 tags or other device: to :woi l m isconnection wii CII I·he 11ew tra.J1. ·former i: i11 .ta lled.

52. Disassembly, Cleaning, Lubrication, and Reassembly of VA Control R 1

D isas:embJe, clean, lubri cate, and r •assembl e V~\. contl·ol lU as insi-rnct·ecl in tmrag raph 30b.

Section Ill. FINAL TESTING

53. Purpose Equipm ent \Yhich ha s been 1·epaircd mu st meet

definite minimum performance standards before it is J·eturn ecl to ser vice. The tests outli ned in th is section are designed to m ea ure the perform ­lllll'e ca pnbiliti es of AF Amplifier AM-465/ FH and. mny he performed by m rLintenan e personnel w·i t.h adequate test equipment an l t h e necessary ski ll s. Equipment meeLino· the minimum r equire­ments listed wi ll flll'Il i h ati. fn,do ry openthon.

54. Test Equipment Required for Final Testing Te. t rq uipmen t of the type li ted below is l'e­

qu iJ ·ccl f or lesLing Lhe J·epnircd af amplifi er: a . ..-1/ . l udio OsC'iJ/(1. /0J' . T he al' a1 1d.io osci l­

lator ( Audi o 0 cilla tor TS- B82A/ U , or eq ual ) must supply ;L constnnt 011tpu t n I fr eq ueneies r;~ng­

ing :f1·om lG to 20,000 cycles. b. J/ l e t's . Two out pu t Yacu um-Lube Yoli'­

meter · (Y lnn ), low range (Electronic Multimete1· :.\lE- fl/ 1\ Bnllnntine m odel 300, or equn 1) nre needrcl. -" noise encl di stmtion n1w lyzer (Dis­to rti on . \n alyzer TS- 723/ ' o r eq 11 n l) i:-> nee<lNl fo 1· cl isLortion tests.

C' . Load Impedances. Two GOO-ohm re istors, :2 " ·niLs, m·e neecled j!or 1wope r londing of the il lll j)l i fieJ'.

55. Final Testing of AF Amplifier AM-465/FR In p nl conn eel ions Jllll st he conn edecl to GOO-ohm

bnlancecl input (par. 17a) . rt. r:-ain (IJld Pmoe1' 01t!Jill{.

(1) Conn ect the audi o osl: illnl o r " ·if h a :-;ou rcc i mpedan ce o C GOO ohm s lo te rm inals 11 an d 12 o-f input plug JL

(2) Plnce a low ran ge o1il Jlll t vtvm <.lin:ctly <lC'l'OSS Le1·mina ls U aml 12 of :input p ln o· .Jl.

(:3) P lnce R 600-ohm Ji xecl com,position re­:-; istor ac l'oss terminals 11 and 12 o f oll t­pt iL p lug .J2.

( -~ ) llnce n, low range ou t·p11t vtvm directly HCl·oss terminn ls 11 and J ~ of output plug .J2 in parall el with t h e GOO-ohm load.

(:3) Set th e VA con trol to !he ma x imnm clock­wi se lJOSi tio11 a H rr lh c ;1mp.li fie r is in opernt:i on.

(G) Set th e audio oscill ator for an output frequency of 1,000 cycles.

(7 ) . \.djust the au dio oscillnl'or o lhnt the l'eading acmss te rlllinnl s II ;I'HI l:l of i n-

P L.Lt plug J1 i . . 00+± mi '1'0\'0lt. The out­pu t reading on the YtYm a ro. s the 600-ohm output load . honl d be 7.75 Yolts. T hi s .is eqnind ent to a G:'5-d lnn gain as co 111 pa reel f·o tl1 e . 00+-~ mi croYolt input J·encling.

b. P1'eque11r·y H I'-' JIO/I M'. The met hod tle:->cribed in parngnt ph :20 ·:tn be usct l fOl' checkin g fr equency J' t' ·pon.'c, but for completeness, an nltemnte lllef hod is di scussed below-

( J) Co nne ·t the equipment a indicated in o(J) through (G) aboYc.

(2) Ya1·_y lh e frequency of th e a11di o osei lla­ioJ· from 30 to 1G,OOO cp s. K eep the read­ing across terminals 11 and 12 of input plug J1 at .OOH mic1·ovol t oYer t h e en­t ire rnnge of frequencies.

(:1) Heacl output on the vtvm acl'oss the GOO­ohm ouLput load nt 30, 50, 100, 1,000, 4,000, 7,000, lOK, 12K anc115K cps. The read­ing s hould not be less thnn 7.75 volts ( ± ] rlb ) .

r·. D isto1·t ion. (1) Connect the equipm ent a. in licated

in a (1) through (G) above. (2) P lace the cli.tor t ion tUlalyzer aero . . the

600-ohm output load. (3) .\dju.t th e audio osc ill ato r so th:tt the

oul;1mt read ino· on the vtvm acros.' the GOO-ohm output load is 24.!.:i volts.

(-1·) , et the <1udio o cillator at t he following :ftWjuencies : 30, 50, 100, 1.000, -~ ,000, 7.000, JOK, 12K, and 15K cps, :mel measm e cli .. to rli on. Th e d istorti on should not exceed 1 per ce nt at 30 C'JlS and .i! percent at 50 to 15K C'ps.

d. LV oi. e L evel . ( L) Plnce a GOO-ohm resistor and a noise an­

nlyzer aero terminals 11 and 12 of out­put p lug J2.

(2) P lace a600-ohm 1·e isto r ncr o;-s lel'minals 11 and12 of input p lug J 1.

(:-1) Set Lhe amplifier Y \. contr o]f·o th e maxi­mum clockwi e position after t he ampli­fier i. in op eration. The no ise leYel r ead­ing on the n oise ana l y;~,e1· sh oukl be Jess than .00195 vol t.

e. 1'_1. Oonh'ol. Rotating· the Y~\. control in a

cO IIll te rclocl\.\ri . e po ilion in !l1e above te. L should Jo\\'Cl' I he ouf·,put voHnge .

37

CHAPTER 6

SHIPMENT AND LIMITED STORAGE AND DEMOLITION TO PREVENT ENEMY USE

Section I. SHIPMENT AND LIMITED STORAGE

56. Disassembly

T he -following instr1wt ion.· are recommended as a g uide for prep aring the amp li fi.er for tr ;Ln spol'ta­tion and storage.

a. Disconnection of Cable . Disconnect input and output J:eceptacles w ith cab les -frmn plugs Jl and J2.

b. R emoval of Unit. Slide the amplifier from Lh e hel:f by p u: h.ing back on th e ejector handles.

57. Repacking for Shipment or Limited Stor­age

,\ ' r; t e. A s far as pos •ible, use the o<· ig inal packn giog materin'l. t l1 nt wer e nved at the t im lhe equipment was unpackecl.

a. T he l'Xn ct I rocecl11rc in ·rcpn cki ng for ship­ment or limi ted .torn ge depend . on the material <LV:1 il ablc and th e cond it ions under whi ch the cqui pment is to be sh i PI eel or . tored. Refer to patagraph 10 and r everse th e in. trnct ions.

b. ·whenever practicable, 1lac a clehydr, ti11g agent uch as sili ca gel inside the ·arton. Protect the ca rton ITith a waterproof scalin g compoun l o1· tape.

Section II. DEMOLITION OF MATERIEL TO PREVENT ENEMY USE

58. General The demolition p1:o ecl11res outlin ed in para­

graph 59 'vill be used to prevent the enemy from using o1· salvaging this equipment. Demolition of the equ ipment wil1 be ac ·ompli heel only upon order of the commander .

59. Methods of Destruction a. S mash. Smash the t ube: , switches, ca paci­

tor. , tra.nsforrners, and resi tors, usin g sledges, axes, hanclaxes, p ickaxes, ·rowbars, or heavy tools.

b. Ottt. Cut cables and wiring, using axes, handa xe ·, o1· machetes.

38

c. Burn . Hum caules, res isto rs, capacitors, wi ring, <Llld technical m:mual s, usin g ga. oline, kero:ene, oil, flam thrower., or incendiary g renad es.

d. JJencl. Bend cha .-is.

e. E x plosives. I:f explo: ives a.rc necess}Lry, use fi rearm , grenades, or T NT .

f. JJi ·posal. Bury or :cn.tLe1· the lest roye l parts in sli t trenche. , fox holes, or other holes, or throw th em into streams.

:;. Dest?'oy. De troy everythi1w.

RESISTOR COLOR CODE MARKING

(MIL-STD RES ISTORS)

AXIAL-LEAD RES ISTORS

(INSULATED)

RADIAL-LEAD RESISTORS

(UN INSULATED)

= =

FIGURE

L----FIRST SIGNIFICANT FIGURE

RC-COMPOS IT ION

A B C D

=

SECOND SIGNIF ICANT FIGURE

'----- FIR ST S IGNIFI CANT FIGURE (DOUBLE WIDTH S IGNIFIE S FIXED WIRE-WOUND RE SISTORS)

RU-WIRE-WOUND

lEND) TOLE

lEND) TOLER

RESISTOR COLOR CODE

(BODY) NCE

RZ-COMPOSITION

E

RZ-COMPOSITION

IR ST SIGNIFICANT FIGURE

IRST SIGNIFICANT FIGURE

BA ND A OR BODY* BAND B OR END* BAND COR DOT OR BAND* BAND D OR END*

FIRST SECOND

COLOR SIGN IFICANT COLOR SIGNIFICANT COLOR

FI GURE FIGURE

BLACK 0 BLACK 0 BLACK

BROWN I BROWN I BROWN

RED 2 RED 2 RED

ORANGE 3 ORANGE 3 ORANGE

YELLOW 4 YELLOW 4 YELLOW

GREEN 5 GREEN 5 GREEN

BLUE 6 BLUE 6 BLUE

, PURPLE 7 PURPLE

7 (VIOL ET) I V IOLET)

GRAY B GRAY 6 GOLD

WHITE 9 WH I TE 9 51 LV ER

*FOR WIRE -WOUND-TYPE RESISTORS, BAND A SHALL BE DOUBLE-WIDTH . WHEN BODY COLOR IS THE SA ME AS THE DOT (OR BAND) OR END COLOR, THE CO LOR S ARE DIF FERENT IATED BY SHADE, GLOSS, OR OTHER MEANS.

MULTIPLIER

I

10

100

1, 000

10,000

100,000

I ,000,000

0. 1

0 .01

EXAMPLES (BAND MARKING): E XAMPLES (B ODY MARKING):

RESISTANCE

COLOR TOLERANCE (PERCENT)

BODY ·t 20

SILVER ± 10

GOLD ±5

10 OHMS ±20 PERCENT: BROWN BAND A; BLACK BAND B; 10 OHMS '±:20 PERCENT: BROWN BODY; BLACK END; BLACK DOT BLACK BAND C; NO BAND 0. OR BAND; BODY COLOR ON TOLERANCE END. 4.7 OHMS ±5 PERCEN T : YELLOW BAND A; PURPLE BAND B; 3,000 OHMS ±.10 PERCENT : ORANGE BODY: BLACK ENO; RED DOT IOOLD BAND C; GO L D BAND D. OR BAND ; SILVER END.

STD-RI

l''iyw·e .'Z5. R es istor color cocles. 39

CAPACITOR COLOR CODE MAR KING

(MIL-STO CAPACITORS)

- --1--MIL IDENTI F IER (BL ACK DOT)

0

=

CHARACTERISTIC" ....--..... / FIRST SIGN IFICAN T F IGURE

===r" ~ .... ~SECOND SIGN IFI CAN T FIGURE

===1_)-~f-DEC IMAL MULTI PLIE R

MIL IDENT IFIER___I"---(_CAPACITANCE TOL ERAN CE (BL AC K SPOT)

TEMPE R AT U RE----~

COE FFI CIEN T r-r.h-1!.--lr-htr--,

INNER-ELE CTRODE TE RMIN AL

NOTE: 0 0

SPO T S MAY BE USED IN STE AD OF BANDS , TEMPER ATURE CO EFFI CIENT MARK ING IS LARGER .

CERAMIC- TEMPERAT URE COMP EN S ATING (CC )

NOTES:

I . SP OT S MAY BE USED ON TUBULAR CAPACITORS; CHARAC TERI STIC SPOT IS L ARGER AND MIL IDENTIFI ER IS ON SIDE DIAMETRI CALLY OPPOS IT E CO LOR SPOTS.

2. MIL IDENTIFIE R OF DI SK TYP E IS ON REVERSE SID E ; CHARAC T ERIST IC SPOT IS LARGER OR SPACE BE TWEEN CHA RAC TERI ST IC AND TOLER ANCE SPOTS IS THREE TI ME S SPAC E BETW EEN AD JAC ENT SPOTS.

3. TOLERANCE: YELL OW, + IOO% , _ 20 % .

CERAM IC-GENERAL PURPOSE (CK)

CAP AC ITOR COLOR CODE

M ULT I PL IER CHARACTERIST IC1 TOLERANCE 2 TEMPERATURE

S IG NUMBE R COE F FIC IENT COLOR

F IG. DEC I MAL OF CM CN CB CK cc (UUFIUFI"C ) CM CN CB ZEROS OVER IOUUF cc IOUUF OR LESS BLACK 0 I NON E A 20 20 20 20 2 ZERO BROWN I 10 I B E B w

I -30 RED 2 100 2 c H X 2 2 2 -80

ORANGE 3 1,000 3 D J D 30 - 150 YELL OW 4 10,000 4 E p

-220 GREEN 5 5 F R

5 0 .5 -330

BLU E 6 6 s 470

PU RPLE 7 7 T w (VI OLET)

- 750

GRAY 8 8 X 0 .25 +30

WH I TE 9 9 - 330C:t 50 0 l 10 I

GO LD 0 .1 5 5 +1 00

SILVER 0 .0 1 10 10 10

I. LETTER S ARE IN TYPE DE SIGNATI ONS GIVEN IN MIL - C SPEC IFIC ATIONS. 2. IN PER CENT , EXCEPT IN UUF FOR CC- TYPE CAPAC ITOR S OF 10 UUF OR LESS.

3

3. INTENDED FOR USE IN CIRCU ITS NOT REQU IRI NG COMPEN SAT ION . STD- CI

40 F' i,q1we 26. Capa cUo1· colo·r co iles.

INPUT CONNECT CT ON Tl

600 OHM 2-3 2

150 OHM 1-2,3-4 5

R24

~~ 5

<

R23 IOK

~ If-i---11 l9 l7 ~ 5 -3

12 T1o .,.a --6 -4

I Jl

-<T

S l

I OFF ON I

I00-130V 50-60'\J

ca I 200 UUF

---11' DUAL POTENTIO~§_T£R_ -----I

~------------ I Rl6 Rl5

l ,aoo l ,aoo

I I 1ST AF AMPL I VI

4 Tl 12 I 6J7

~' I

I~ I 3 'I:; I 5~~ 3 :~ RIA I

1:? IOO< lOOK ~ -- 4 I

2 I~ K2s· [ill ·~ ~ 1-::> < 5~ 1:? 2 7 -

g lg XX

£ II

I

--

R26 330

R2 470

I 2 -- 52

\ 0 0 ~3

lMETERl

T3 4

125V 12~ 5V

~ 2AMP ~

II.~ 6 7 11 5V

-~ ~:660V l Fl 6aMA I AMP ~ ~- ~

~ 105V 10~

-~ I

~ I)<>. 6 .3 V R6~-X

14_:; ~~ 2 1.5AMP

3 101{ 5

jHU Mj

X

I /\. v

I C4

I ~~ I 20 AF AMPL AF OUTPUT AMP~ I 3 V2 V3 3

5/-=.~4 6L6 r-~4 I 6J7

I 1/ 5 ==~· Rl~}- I - 1 -- I 11~7 ·~ lOOK ~I C6 2 7 -

C3 @ 2 7 -

f L' .25 ::::;::: XX X X

RIO Rl l > I MEG < 220K R3 R5 Rl3

470K> 120K < 390 < >

R7 ~R9 6ao IK ._____

,.---

~r 18K > > '>Ra Rl2 Rl4

;:: < 1,500 :.:r: 470K< 22

C1 C5

4 I ~

:~ 8

6 I

.I 3,900UUF

.......

-r-- -

-r-- -;::_ ;::' =---- .:: I A 1'-.._

R22 C2 Bl R2 1 I 1.;~ I L-- _<o 5,600 20 _ _J 5,60 0 __ ....... ---

v v

A v R17 600

PLAtE SUPPLY --r: :::;:::::

RE:CTIFIER C9 CIO

V4 5\'3-GT

ao

NOTE S:

I. UNLESS OTHERWISE SHOWN, RESISTORS ARE IN OHMS, CAPACITORS ARE IN UF.

ao

:.:k Cl2 . 01

2. CJ INDICATES EQUIPMENT MARKING .

Fi(J'Itl"e £?' . .4.F Amplifier AM-1,.65/fi'R, schematic diagram.

SR I a > a,200

fRI9 < a2K

~R20 5,600

J 6 :; 4,700 .Q2 ~ Cl3

560UUF :;: ----< 4 ;;;

:::;::: Cl4 ~ 3,300UUF

~ ~ Oi

I ~

* Cll 4 0

T2

I<;> 12

~--=·II

~ <?'10 g_ 600 OHMS

:§'9 :?_ZERO OHMS

*-a o_ 7-

OUTPUT

5 OHM

7.5 OHM

15 OHM

150 OHM

600 OHM

~ II •~9 ~~7 5 ... _3

j 12 io1' • 6 T4 c....___]

J2

TERMINALS ON J2

3-4

7-a 9-10

10-11

11 - 12

TM5101-21

322130- 0- 54 (Fac e p. 40)

Ampli liPr: I• irst af __ P.ower_,, • 'econd af

App li cat ion , s~·s te n r Ar<:Lie opeml ion _ Attenuator _

Balanced hricl ~ i ng input c·onrrPl'lions Balanc· ,<] inpnt:

150 ohms_ GOO olu11s

13lock d iagmm _

Characlp ristics, l eehn ical Circu it :

Input :'lfelcring_ i\lodifieat ion ~ Orrt.pnt

Component s, table Con ncc l ions__ _ Control~-

earaaraph .~

37, 30 37, -II 37, -10

4 23a

20, ~5

17e

17c lin 37

5

38 16 ]\)

JS 7

17, I S 21

Data, t rou i>IPsiloot.ing; -l ·l De n•s i~t.ance of t.nwsfom1cr~ 50 ]) •tin ilio rr or preventive rn aintcnanc' 2(i

Demolition 5 , f)\1 Descr iption , A I•' Amplif-ier .\.:'l[--lli5/ I•'H _ _ 8 Deser t mainLPnanee __ _ _ 23c. 31rl Dimensions, packaging __ (i

D i::;assembly of VA control 30c, 52

Equipment : Final tc•sling __ Troubleshooting

Equ ipment performance chel'kli.-<1

l•'ccdbaek theory _____ _

Jlield maintenance instruction _. F'orms and r ecords __ _

Freqtre n c~· : Cllarac(,e r i ~; Lics

Compensation __ Hcsponsr tesLing __

(;ain control __

Ceneral: Precautions _ Troubleshooting procrc!urPs

I I rate r~

J l um c·ont rol _

'll -13

2

20 l l)b 20b

21, 30

ciG cJ3

-12, -17 2 1, -121'

INDEX

I'O{/t

25, 26 25,27 25,27

3 16

15, 32

11

11 10 25

4

26 10 12 12 4

10, 12 16

32 36 18 38

4 17, 22

'1 21 , 36

37 35 24

27 30

3

15 12 15

16, 21

32 30

29, 32 16, 29

111] ll t: PO\I' CI'

Hrsisl.ance measureme-nt s __ 1-'hielding ________ _

Trarrsformcr _ Tnput. circuit, __ _ Tnput co nnect ions:

Balanced bridging _ 150-ohm balanced __ 150-ohm 111tbalanct'd GOO-ohm balanced 600-o hm unbalancPd

Tn specl iorr, visual _ f nstallat iorr:

Equipmrnt ___ _

Tubes and capacito r;; ln~ t rlllll (' ll l;; __

Line, ac Low-frrqm•ncy r esponse J,ubricat.ion Lubrieat.ion insl rH cl ion .· for dual polcnti­

omr ler·s __

J\ l atc hing: lnput conncctiu rr s __ Output connccLiorl s. _

]\Ja!Priak :'IJ c ( c r.i rw:

Circuit s __ Single unit i:i.1·. I Clll _

]\ [od i fi e at ions: Ac power suppl _,. __ Ci r ·uiL __ _

i\ l our rt ing: A CCCSHO I' i CS

Amplifier_

Opc•rat ion: Arc I ic climates __ I)C'~C'rL climaLcs ____ _ Tropical clirnatcs __ l 'n n ~ u a l cond itions_ rsual concl iLions ___ _

Output: Amplifier_ __ _ Conrr ce l.ions __ Trarrsfornrrr __

Packag irrg __

J>ara(Jrttpfls

ii -17 15

17, 37a 38

17e 17c 17d 17a 17b 3-1

'13

JJ 20a, -1:)

5 1\ld 30

30

17

25

16 1Gb J6a

19a 19

1 3b 13a

23o 23c 23b

23 20

37d 18

37e

6

4 32 10

10, 25 26

11 11 11 10 11 23

9 7

13, 32

4 13 21

21

10 12 18

10 10 10

12 12

10 9

16 17 17 16 15

25 12 25

4

41

Pain Ling ____________________________ _ Par ts replacement ____________________ _ Per form ance, equipment checklisL __ __ _ Power:

Input ___ ______ _________________ _

Proven Live maintenauce _____ ___ ··- __ .. __ _ Supply __________________________ _

Paragraphs

32 51 36

5 26, 29

42

Pa ge

22 36 24

4 18, 2.L

29 ltec ' piacle connect ions ___ ·------------- 12 7 R.ectifier_ ___ _____________ ------- ---- 37e, 4-2 25, 29 l tepacking ___________________ ----- -- 57 38 H.ep lacement of par Ls __ ____ ---------- - - 51 36 Resistance normaL ____ ________________ 47 32 Ru nning spares ___ ________ ----------- !) 6 H.u ~Lproofi ng_______ _______ --- --- -- 33 23

f:l hielding, input __ ______ ------- - ---- 15 10 Signa l subst itut ion _____ ______ ---------- .J 3b 30 Spar s _________ ___________ ---------- 9 G SysLcm application _______ -··- - ------ 3

Tab le of componen Ls___________________ 7 'l Techn ical character isLics_--- ---- _- _- _ _ _ 5 <1 Test equipment ___________ : ------- 20, 45, 54 15,32,37

[ 413.47 (14 Oct 54) J

42

Tc~ L in g, fi na l _____ _ Theory ___________ _

' l ' ra n sfonner~--- - ___ _ TropiealmaintcnancC' Troubleshooting:

ClHn-t_ _ _ _ _ _ _ _ _ .. Da La _____________ _

Unbala nced inp ut connect io n, : J 50-ohm ______________ _ 600-olnn _________ _

UniL weight __________ _ Unpack ing_~------ ___ _ liscd equipment_ _____ _

VA co nLrol: D isassem bly __ L11bri caLion __ _

V i ~ 11 a l .i nspccLion __

W eaLli cJ·proofin g _ _ _ _ _ . _ _ _ Weight____________ _____ _ _ Win Ler main Lcnancc ______________ --

l'arartraphs Panr

55 37

37- 42 25-29 37, 50 25, 26

31b 21

-136, 11!J 30, 35 44 32

17d J1 1.7b 11 (ia 4

JO 7

14 10

30 21

30 21 3,1 23

31 21

Ga 4

3l c 22

' BY ORDER OF 'l'HE SECRETARY OF 'l'I-IE ARMY:

0 Ji')OJUI.\], ;

J'OHN A. KLEIN, 11! ajo?' Cenm·al, United States A.rmy,

1'he Adjutant Ceneml.

J )J fi 'l'lUilU'!'lON:

Acti ve Anny: ' I' · Sv<.:, DA (l) Gc•n & l\r SYc Sell (G)

'fcc Svc Dd (1) Sig ' Sch (25) . \l~F ([)) Gen Depots (2) AFJ!' Bel (inc l cfl Test SigC Sec, Gen Depots ()0)

Sec) (1) Sig-C Depots (20)

Army AA Comd (2) POE (2) OS Ma.i Cornel (5) OS Sup Agencies (2) OS Bnse Comcl (5) ,' igU l<'ld J\ luin t Sl1ops (3)

Log Comcl (5) SigC Lnb (5) MDW (1 ) M il Dist (1) Armies (5) Un its orgnn izedun cler J:ol-Corps (2) lowing TOE: T'ng Div (2) ll - 127, Sig B.ep Co li't & Cp (2) (2)

NO: ume as Active Army cxcevt ullownncc is one copy for each unit. USilR: None.

Hlcs · otherwi ·e noted, Ll islrib ution D[lplies Lo ConUS and overseas. l<'or expla nation of ;~ b i.Jr evia t ions usecl,. ec SB. 320-50-l.

M. B. RIDGWAY, General, United States A.nny,

Ohief of Staff.

Units organized under fol­lowing TOE-Con .

11-12SA,. igDepotCo (2)

11- 500A (AA-AE), Si ,11; Admi n 'l'efl lllS (2)

11-G '7A, Sig Base l\Iaint Co (2)

11-592A, llq & J fq Co, Sig Bas Depot (2)

11-597 A, Sig Bn. e Depot Co (2)

U. 5 . GOVERtlhiENT PRINTING OFFICE: 1954

43

TM 11-5101 c 1

AF AMPLIFIER AM-465 /FR

CHANGE}

No.1

TM 11-5101, 8 November 1954, is changed as follows:

Pages: Add paragraph 1.1 after paragraph 1.

1.1. Index of Publications

Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions, changes, or additional publications pertaining to the equipment. Department of the Army Pamphlet No. 310-4 is an index of current tech­nical manuals, technical bulletins, supply bulle­tins, lubrication orders, and modification work orders available through publications supply channels. The index lists the individual parts (-10, -20, -35P, etc.) and the latest changes to and revisions of each equipment publication.

Delete paragraph 2 and substitute:

2. Forms and Records

a. Reports of Maintenance and Unsatisfac­tory Equipment. Use equipment forms and records in accordance with instructions in TM 38-750.

b. Report of Damaged or Improper Ship­ment. Fill out and forward DD Form 6 (Re-

HEADQUARTERS, DEPARTMENT OF THE ARMY

WASHINGTON, D.C., 9 October 1963

port of Damaged or Improper Shipment) as prescribed in AR 700-58 (Army) , NAVSANDA Publication 378 (Navy), and AFR 71-4 (Air Force).

c. R eporting of Equipment Manual Improve­ments. , The direct r eporting by the individual user of errors, omissions, and recommendations for improving this manual is authorized and encouraged. DA Form 2028 (Recommended changes to DA technical manual parts lists or supply· manuals 7, 8, or 9) will be used for reporting these improvements. This form will be completed in triplicate using pencil, pen, or typewriter. The original and one copy will be forwarded direct to: Commanding Officer, U.S. Army Electronics Materiel Support Agency, ATTN: SELMS-MP, Fort Monmouth, N.J.,

07703. One information copy will be fur­nished to the individual's immediate super­visor (officer, noncommissioned officer, super­visor, etc.).

Page 18. Delete chapter 3 heading and sub­stitute: MAINTENANCE INSTRUCTIONS.

Delete sections I and II and substitute:

Section I. OPERATOR'S MAINTENANCE

24. Scope of Operator's Maintenance

The maintenance duties assigned to the op­erator of the equipment are listed below to­gether with a reference to the paragraphs cov­ering the specific maintenance function.

a. Daily preventive maintenance checks and services (par. 27) .

b. Weekly preventive maintenance checks and services (par. 28).

c. Cleaning (par. 29).

25. Preventive Maintenance

Preventive maintenance is the systematic care, servicing, and inspection of equipment to prevent the occurrence of trouble, to reduce downtime, and to assure that the equipment is serviceable.

a. Systematic Care. The procedures given in paragraphs 27 through 29 cover routine systematic care and cleaning .essential to proper upkeep and operation of the equipment.

TAGO 6369A- Oct

~,ft PROPERTY OF THE TECHNICAL LIBRARY DO NOT REMOVE FROM BUILDING

b. Preventive Maintenanc e Checks and Serv­ices. The preventive maintenance checks and services charts (pars. 27 and 28) outline func­tions to be performed at specific intervals. These checks and services are to maintain Army electronic equipment in a combat-service­able condition; that is, in good general (physi­cal) condition and in good operating condition. To assist operators in maintaining combat serviceability, the charts indicate what to check, how to check, and what the normal con­ditions are; the References column lists the paragraphs or manuals that contain detailed repair or replacement procedures. If the defect cannot be remedied by performing the correc­tive actions listed, higher echelon maintenance

,. or repair is required. Records and reports of these checks and services must be made in ac­cordance with the requirements ·set forth ill TM 38-750.

26. Preventive Maintenance Checks and Services Periods

Preventive maintenance checks and services of the equipment are required daily and weekly. Paragraphs 27 and 28 specify the items to be checked and serviced. In addition to the routine daily and weekly checks and services, the equip­ment should be rechecked and serviced immedi­ately before going on a mission and as soon after completion of the mission as possible.

27. Daily Preventive Maintenance Checks and Services Chart

SeQu ence No. Item Procedure

1 Completeness______________ See that the equipment is complete ( SIG 7&8 AM- 465 / FR).

2 Cleanliness_________________ Clean the exterior surfaces (par. 29). During cleaning operation, inspect for damaged, missing, or loose hardware and controls.

3 Operation__________________ During operation be alert for any unusual per-formance or condition.

28. Weekly Preventive Maintenance Checks and Services Chart

Sequence No. Item Procedure

1 Exterior_________________ __ Inspect all exposed surfaces for chips, cracks, None. rust, corrosion, and mildew.

2 Controls___________________ Inspect all operating controls for binding, None. scraping, and excessive looseness.

References

References

29. Cleaning

Inspect the exterior of the equipment. The exterior surfaces should be clean, and free of dust, dirt, grease, and fungus.

b. Remove grease, fungus, and ground-in dirt from the case; use a cloth dampened (not wet) with Cleaning Compound (Federal stock No. 7930-395-9542).

a. Remove dust and loose dirt with a clean soft cloth.

Warning: Cleaning compound is flammable and its fumes are toxic. Provide adequate ven­tilation. Do not use near a flame.

2

c. Remove dust or dirt from plugs and jacks with a brush.

d. Clean the front panel and control knobs; use a soft clean cloth. If necessary, dampen the cloth with water; mild soap may be used for more effective cleaning.

AGO 6369A

Section II. ORGANIZATIONAL MAINTENANCE

29.1. Scope of Organizational Maintenance

a. This section contains instructions cover­ing second echelon maintenance of the equip­ment. It includes instructions for performing preventive and periodic maintenance services, and repair functions to be accomplished by the organizational repairman.

b. Second echelon maintenance of the equip­ment includes:

(1) Replacement of defective tubes and fuse (fig.5).

(2) Preventive maintenance (pars. 29.2 through 29.5).

(3) Lubrication (par. 30). ( 4) Troubleshooting (pars. 35 and 36).

29.2. Preventive Maintenance

a. Preventive maintenance is the systematic care, inspection, and servicing of equipment to maintain it in serviceable condition, prevent breakdown, and assure maximum operation capability. Preventive maintenance is the re­sponsibility of all echelons concerned with the equipment and includes the inspection, testing, and repair or replacement of parts, subassem­blies, or units that inspection and tests indicate would probably fail before the next scheduled

periodic service. Preventive maintenance checks and services of the equipment at the second echelon level are made at quarterly intervals un­less otherwise directed by the commanding officer.

b. Maintenance forms and records to be used and maintained on this equipment are specified in TM 38-750.

29.3. Quarterly Maintenance

Quarterly preventive maintenance checks and services on the equipment are required. All deficiencies or shortcomings will be re­corded in accordance with the requirements of TM 38-750. Perform all the checks and serv­ices listed in the quarterly preventive mainte­nance checks and services chart (par. 29.4) in the sequence listed. Adjustment of the main­tenance interval must be made to compensate for any unusual operating conditions. Equip­ment maintained in a standby (ready for im­mediate operation) condition must have quar­terly preventive maintenance checks and serv­ices performed on it. Equipment in limited storage (requires service before operation) does not require quarterly preventive mainte­nance.

29.4. Quarterly Preventive Maintenance Checks and Services Chart

Sequence No. Item Procedure

1 Completeness_______________ See that the equipment is complete (SIG 7&8, AM-465 / FR).

2 Cleanliness_______________ _ Clean the exterior and interior of the equip-ment (par. 29). During cleaning operations, replace or tighten damaged, missing, or loose hardware and controls.

3 Exterior __________________ _ Inspect all exposed surfaces for chips, cracks, rust, corrosion, and mildew. Touchup paint as required (par. 29.5).

4 Lubrication ________________ Lubricate the equipment (par. 30 and fig. 17). 5 Pluckout items____________ _ Inspect seating of pluckout items. Make sure

that tube clamps grip tube bases tightly. 6 Transformer terminals_____ Inspect the terminals on the power trans-

former. All nuts must be tight. There should be no evidence of dirt or corrosion.

7 Terminal blocks____________ Inspect terminal blocks for loose connections and cracked or broken insulation.

AGO 6369A

References

3

I "' 29.4 . . Quarterly Preventive Maintenance Checks and Services Chart- Continued

SeQuence I I I No. Item Procedure References

8 Resistors and capacitors __ __ Inspect the r esistors and capacitors for cracks, blistering, or other detrimental defects.

9 Operation ________________ __ Operate the equipment according to paragraph Paragraph 36. 36.

10 Publications_______________ See that all publications are complete, service- DA Pam 310-4. able, and current.

11 Modifications__ ___ ________ _ Check DA Pam 310-4 to determine if new ap- TM 38- 750 and plicable MWO's have been published. All DA Pam 310-4. URGENT MWO's must be applied immedi-ately. All NORMAL MWO's must be sched-uled.

12 Spare parts_____ ________ __ Check all spare parts (operator and organiza- SIG 7&8 AM- 465 / FR. tiona!) for general condition and method of storage. There should be no evidence of overstock, and all shortages must be on valid r equisitions.

29.5. Touchup Painting Instructions Page 32, paragraph 45, chart. Delete first item and substitute: Test Set, Electron Tube TV-7 / U; TM 11-6625- 274-12.

Remove rust and corrosion from metal sur­faces by lightly sanding them with fine sand­paper. Brush two thin coats of paint on the bare metal to protect it from further corrosion. Refer to the applicable cleaning and refinishing practices specified in TM 9-213.

Page 36, paragraph 52. Change "paragraph 30b" to paragraph "30".

Page 37, paragraph 54b. Delete "ME-6/ U, Ballantine model 300, or equal" and substitute:

Page 19 . Delete figure 15. Page 20. Delete figure 16. Page 21. Delete paragraph 31.

ME-30A/ U.

Page 38. Add the following appendix after chapter 6.

Page 24, item 4, action or condition column. Change "23" to "16".

DA Pam 310-4

TM 9-213 TM 11-2044 TM 11-2096

TM 11:-5097 TM 11-5527 TM 11-6625-261-12

TM 11-6625-274-12

TM 11-6625-320-12

TM 38-750

4

APPENDIX

REFERENCES Index of Technical Manuals, Technical Bulletins, Supply Bulletins, Lubri-

cation Orders, and Modification Work Orders. Painting Instructions for Field Use. Attenuators TS-403/ U and TS-402A/ U. Test Set TS-140/ PCM; Signal Generators SG-15/ PCM and SG-15A/

PCM; and Decibel Meters ME-22/ PCM and ME-22A/ PCM. Spectrum Analyzers TS-723A/ U, TS-723B/ U, and TS-723C/ U. Multimeters TS-352/ U, TS-352A/ U, and TS-352B/ U. Operator's and Organizational Maintenance Manual: Audio Oscillators

TS-382A/U, TS-382B/ U, TS-382D/ U, TS-382E/ U, and TS-382F / U. Operator's and Organizational Maintenance Manual: Test Sets, Electron

TubeTV-7/ U, TB-7A/ U, TV-7B/ U, and TV-7D/ U. Operator's and Organizational Maintenance Manual: Voltmeter, Meter

ME-30A/ U and Voltmeters, Electronic ME-30B/ U and ME-30C/ U. The Army Equipment Record System and Procedures.

AGO 6369A

By Order of the Secretary of the A·rmy : "

Official: J. C. LAMBERT, Major General, United States Army, The Adjutant General.

Distribution:

Active Army : USASA (2) CNGB (1) CofEngrs ( 1) TSG (1) CSigO (7) CofT (1) CofSptS (1) USA CD Agcy (1) USCONARC (5) USAMC (5) ARADCOM (2) ARADCOM Rgn (2) OS Maj Comd (3) OS Base Comd (2) LOGCOMD (2) USAECOM (5) USAMICOM (4) USASCC (4) MDW (1) Armies (2) Corps (2) USA Corps (3) USATC AD (2) USA TC Engr (2) USATC Inf (2) USATC Armor (2) USASTC (5) Instl ( 2) except

Ft Monmouth ( 65) Svc Colleges (2) Br Svc Sch (2) except GENDEP (OS) (2) Sig Dep (OS) (12) Sig Sec, GENDEP (5)

NG: None. USAR: None. For explanation of abbreviations used, see AR 320-50.

AGO 6369A

EARLE G. WHEELER, General, United States Army, Chief of Staff.

Army Dep (2) except Ft Worth (8) Lexington (12) Sacramento (28) Tobyhanna (12)

USA Trans Tml Comd (1) Army Tml (1) USAOSA (1) POE (1) WRAMC (1) AMS (1) AFIP (1) Army Pic Cen (2) USA Mbl Spt Cen (1) USA Elct Mat Agcy (12) Chicago Proc Dist ( 1) USA Elct RD Actv, White Sands (13) USA Elct RD Actv, Ft Huachuca (2) USARSOUTHCOM Sig Agcy (1) Sig Fld Maint Shop (3) Units org under fol TOE: Two copies each unit UNOINDC:

11-7 11-16 11-57 11-98 11-117 11-155 11-157 11-500 (AA-AE) (4) 11-557 11-587 11-592 11-597

'(:[ U. S . GOVERNMENT PRINTING OFFICE: 1963-700!576

5