OUTPUT PENTODE - r-type.org · PDF filemA mA V mA/V kil OPERATING CONDITIONS AS SINGLE VALVE...
Transcript of OUTPUT PENTODE - r-type.org · PDF filemA mA V mA/V kil OPERATING CONDITIONS AS SINGLE VALVE...
OUTPUT PENTODE
Output pentode rated for 25W anode dissipation,
ntended for use in a.c. mains operated equipment.
PRELIMINARY DATA
HEATERVh
Ih
6.31.5
vA
CAPACITANCES7.2
15.5<1.1<1.0
11
pFpFpFpFpF
Cout
Cln
C&-gl
Cgl-hCk-h
CHARACTERISTICSVa
v go
Vgs
la
Igo
Vgl
gm
ra
(.I.gl-gO
250250
0100
14.9-13.5
111511
vvv
mAmA
VmA/V
kil
OPERATING CONDITIONS AS SINGLE VALVE CLASS "A"AMPLIFIER
Pentode connection
Va 250 VVg2 250 VVga 0 VVg1 -13.5 VRk 120 (1la 100 mAIg2 14.9 mAR. 2.0 k(1V1n (r.m.B.) (Pout=50mW) 0.5 V
*Pout 11 WV1n (r.m.B.) 8.7 V
*Dtot 10 %
*Pout and Dtot are measured at fixed bias and therefore represent thepower output available during the reproduction of speech and music.When a sustained sine wave is applied to the control grid the biasacross the cathode resistor will readjust itself as a result of theincreased anode and screen-grid currents. This will result inapproximately 10% reduction in power output.
ISSUE 2 EL34 256-1
OUTPUT PENTODE
Output pentode roted for 2SW onode dissipotion,
intended for use in a.c. mains operated equiPment.
OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL
Distributed load conditions with screen-grid tapping at 43% ofprimary turns
4301
4252 x 62.5
2x652x5.02x5.1
470326.6
200.8
430
1
425
2 x 62.5
2x70
2x5.0
2x7.5
470
52
6.6
37
1.3
vkO
VmAmAmAmA
OV
kOW
%
V"J-VRk
Rg2 (per valve)
Vg2+VRk
18(0)
18 (max. sig.)
Ig2(0)
Ig2 (max. sig.)
Rk (per valve)
V1n(gl-gl) r.m...
R8-8
Pout
Dtot
OPERATING CONDITIONS FOR TWO VALVES IN PUSH.PULL
Fixed bias
4251000
0
2x30
2x120
2x4.4
2x25
-38
3.4
54
55
5.0
375470
0
2x35
2x120
2x4.7
2x25
-32
2.8
45
44
5.0
yOy
mAmAmAmA
ykO
yW%
Vb
"Rg2
Vg2
18(0)
la (max. sig.)
Ig2 (0)
Ig2 (max. sig.)
Vg1
R8-a
V1n (gi-g 11 r.m.8.
Pout
Dtot
*Screen-grid resistor common to both valves,
These operating conditions apply with a stabilised line voltage andallow for a 25V drop in the primary winding of the output trans-former at maximum signal. If there is an additional drop of 25Vin the h.t. line voltage at maximum signal Pout=45W and 36W.The optimum anode-to-anode load under these conditions are4.0kD. and 3.8kD. respectively.
ISSUE 2 EL34 256-2
OUTPUT PENTODE
Output pentode rated forc25W anode dissipation,
intended for use in a.c. mains operated equipment
OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL
With separate screen-grid supply and fixed bias
Vb(a) 500 800 VVb(g2' 400 400 V
*Rg2 750 750 !1Vg:J 0 0 VJa(O; 2x30 2x25 mAla (max. sig.) 2x125 2x91 mAIg2(o, 2x4.0 2x3.0 mAIg2 (max:sig.) 2x25 2x19 mAVg1 -36 -39 VRa_a 4.0 11 k!1VIR (g,-g,) r.m.B. 51 47 V
, PC))1~ 70 100 WI Dto1 5.0 5.0 %
,*Screen-grid resistor common to both valves.
These operating conditions apply with stabilised line voltages andallow for a 2SV drop in the primary winding of the output trans-former at maximum signal. If there is an additional drop of 25Vin the line voltages at maximum signal Pout=58W and 90W. Theoptimum anode-to-anode load under these conditions are 5.0k!1and 11 kO respectively.
OPERATING CONDITIONS FOR TWO VALVES IN PUSH.PULL
Cathode biasVb 375 V
*Rg. 470 OtRk 130 OVg. O Vla(ol 2x75 mAla(max.sig.) 2x95 mAIg.(ol 2x11.5 mAIn (max.c5jgr) ! 2 x 22.5 mARa_a 3.4 kOV1n(gl-gl) r.m.8. 42 VPout 35 WDtot 5.0 %
*Screen-grid resistor common tO both valves.
tCommon cathode bias resistor.
These operating conditions allow for a 20V drop in the primarywinding of the output transformer and a 5V drop in the h.t. linevoltage at maximum signal.
ISSUE 2 EL34 1056.3
OUTPUT PENTODE
Output pentode rated far 25W anode dissipation,
intended for use in a.c. mains operated equipment.
"A"OPERATING CONDITIONS AS SINGLE VALVE CLASSAMPLIFIER
Triode connection (g2 connected to a, ga to k)
Va+VRk 375V 0R~a 370la 70Vgl -26Ra 3.0V1n (r.m.s.) (Poul=50mW) 1.7Poul 6.0V1n (r.m.s.) 18.9Dlo1 8.0
vvO
mAV
kOV
WV
%
OPERATING CONDITIONS FOR TWO VALVES IN PUSH-PULL
Triode connection (g2 connected to a, g3 to k)
V,,+VRk 400 430 VV83 0 0 V
*Rk 220 t250 .0I,,(o) 2x65 2x64 mAI" (max. sig.) 2x71 2x67 mAV81 -29 -32 VR"_,, 5.0 10 k.OV1n (81-81) r.m.s. 44 48 VPoul 16 14 WD1o1 3.0 <1.0 %
*Common cathode bias resistor.
tUn-bypassed.
LIMITING VALUES
2.0800
2527.5
800425
8.0150-1.3
70050010020
kV
V
W
W
V
V
W
mA
V
k.Q
k.Q
V
k.Q
Va(b) max.Va max.Pa max.Pa max. (max. signal speech and music)V lI(b) max.VII max.pgo max.Ik max.Vn max. (In=+0.3!J.A)Rn-k max. (cathode bias)Rn-k max. (fixed bias)Vh-k max.Rh-k max.
ISSUE 2 EL34 1056.4
OUTPUT PENTODE
Output pentode roted for 2SW anode dissipation,
intended for use in a.c. mains operated equipment.
~
92 91
HCa
q2
h h
kq3
Oclal Bas,
~EL3~ 1056-5ISSUE 2
OUTPUT PENTODE
Output pentode rated for 25W anode dissiPation,
intended for use in a.c. mains operated equiPment.
ANODE AND SCREEN-GRID CURRENT PLOTTED AGAINST CONTROL
GRID VOLTAGE
EL34 1056-6ISSUS;2
OUTPUT PENTODE
Output pentode roted for 25W onode dissipation,
intended for use in a.c. mains operated equiPment.
~0-
~I
>"i'
>O
."'"""-' "..."'
::'
>OII
I~,0.:~..
0~~a..
HE
ANODE CURRENT PLOTTED AGAINST ANODE VOLTAGE WITH
CONTROL-GRID VOLTAGE AS PARAMETER Vg.=250V
@ EL34 357.7ISSUE 2
OUTPUT PENTODE-
Output pentode rated for 25W anode dissipation,
intended for use in a.c. mains operated equipment.
ANODE CURRENT PLOTTED AGAINST ANODE VOLTAGE WITHCONTROL GRID VOLTAGE AS PARAMETER Vg2=360V
cW ~EL34 357-8ISSUE 2
OUTPUT PENTODE
Output pentode rated for 25W anode dissipation,
intended for use in a.c. mains operated equipment.
OUTPUT PENTODE
Output pentode rated for 25W anode dissipation,
intended for use in a.c. mains operated equipment.
~'(.;.w.J(000000 00000 O Oj)~O~OO--m
;!i, .+~..I l' .I
02
-:1 ~ ~ ,
-ti:J',
II
~>--+~ ~
::r;.~ , .,
~Ei05::=.
0~ ~
!(VUI)1
(..IU,)(I6-I!).!~ ~ oo
0.
N~
PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH DISTRIBUTED LOADCONDITIONS. SCREEN-GRID TAPPING AT 43% OF PRIMARY TURNS
@ISSUE 2 EL34 105610
~--o
.-!~:,1.:;.:.
]~
»c:~$~~.~'!' c
..
.&
OUTPUT PENTODE
Output pentode roted for 25W onode dissipotion,
intended for use in a.c. mains operated equipment.
.~
0Q
c> E
°
OM
::;.
~:
~+
(vw)I ~
l""'A)U!A ~
~Ofo) ...0 ~
0.
2~
PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH FIXED BIAS ANDVb=375V
eISSUE 2 EL.34 1056-1 f
OUTPUT PENTODE
Output pentode rated for 25W anode dissipation,
intended for use in a.c. mains operated equipment.
;;
12
.,"'; " , "(Vw)1 9 9 8 o-~- "' -
O
-0
0. ~, ( .."A ) U!A
~(010) .O.a ~
PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH FIXED BIAS ANDVb=425V
ISSUE 2 EL34 1056-12
OUTPUT PENTODE
Output pentode rated for 25W anode dissipation,
intended for use in a.c. mains operated equipment.
PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH SEPARATE ANODEAND SCREEN-GRID VOLTAGE SUPPLIES AND FIXED BIAS V"(b)=SOOV,
Vg2(b)=400V
@EL34 256-13ISSUE 2
OUTPUT PENTODE
Output pentoderated for 25W anode dissipation,
intended for use in a.c. mains operated equiPment.
PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH SEPARATE ANODEAND SCREEN-GRID VOLTAGE SUPPLIES AND FIXED BIAS Va(bl=800V.
V"(b)=400V
1@EL3. 256.11ISSUE 2
OUTPUT PENTODE
Output pentode rated for 25W anode dissipation,
intended for use in a.c. mains operated equipment.
PERFORMANCE OF TWO EL34 IN PUSH-PULL WITH CATHODE BIASAND Vb=37SV
~EL34 1056-15ISSUE 2
ISSUE 2
EL34OUTPUT PENTODE
EL34 1056-16
OUTPUT PENTODE
Output pentode rated for 25W anode dissipation,
intended for use in a.c. mains operated equiPment.
PERFORMANCE OF TWO EL34 IN PI,JSH-PULL TRIODE CONNECTED
ISSUE 2 EL34 1056-17