Tube Screamer TS-808 Clone Plaudddtz

8/17/2019 Tube Screamer TS-808 Clone Plaudddtz

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History

The Ibanez Tube Screamer is an overdrive pedal. The most popular use of a tube screamer is topush a tube amp to make it overdrive more. The pedal has a characteristic mid-boosted tonepopular with blues players. The "legendary" Tube Screamer has been used by guitarists such asStevie Ray Vaughan to create their signature sound, and is one of the most popular and mostcopied overdrive pedals.

Description

When used with a tube amplifier the Tube Screamer increases the gain of the input signal,overloading the preamp and further distorting the signal. When used with a cranked master-volumetype tube amplifier, this can result in much higher volumes than before the pedal is engaged if thepreamp is not already turned up fairly high. Provided the preamp gain is already turned up, the TubeScreamer will saturate the signal, creating a thickly overdriven tone.

The pedal has an overdrive knob, a tone knob, and a level knob. The drive knob controls the level ofdistortion, the tone knob adjusts the amount of treble in the sound, and the level knob controls theoutput volume of the pedal. The pedal can be used on a solid-state amp to try to mimic the sound ofa vintage tube amp, although many guitarists prefer to use it to push a tube amp's pre-amp into anoverdriven state. The classic Tube Screamer sound includes a "mid-hump," which means that thecircuit accentuates frequencies between the bass and treble ranges (mid-frequencies). Manyguitarists prefer this sort of equalization, as it helps to keep their sound from getting lost in theoverall mix of the band.

Variations

The pedal was produced with many variants. The early incarnations of the TS-808 (with and without

hyphen) and TS9 are the most sought after by collectors. Other variants, including the TS10, TS7,and TS5 are less collectible and vary in their reproduction of the original circuit. The TS-9 and TS-808 pedals have been reissued, and according to the company, feature the same circuitry,electronics and design components that helped to shape the famous Tube Screamer sound. Somemusicians have a technician perform modifications to the unit to change the sound to their liking.Also, Maxon, who produced the original Tube Screamer pedals for the Ibanez brand in theseventies and eighties, produce their own version of the Tube Screamer. In addition, many of themost highly-regarded overdrive pedals, both mass-manufactured and boutique, owe their heritageto the Tube Screamer circuit.

Publishing allowed, if no modification is made or author´s credit is changed.

First published in 13/03/2011 at www.handmades.com.br

®Ibanez Tube Screamer 808



Design

Mr. S. Tamura, the designer of the Tube Screamer, used a subtle clipping circuit to create thepedal's sound. He mixed the input signal with the output signal of the clipping circuit, which"preserves the original dynamics of the input signal which otherwise would get lost at the thresholdof clipping.": In this fashion, it preserves the "original dynamics of the input signal [and] avoidsmuddiness and vastly improves clarity and responsiveness." As well, Tamura added a post-clipping

equalization circuit with a first-order high-pass shelving filter that "is linearly dependent on its gain",an approach called "progressivity." Characteristic of its clipping is the symmetrical nature.

The Tube Screamer uses electronic FET bypass switching. The circuit uses transistor buffers atboth the input and the output. The overdrive is produced using a variable gain op-amp circuit withmatched diodes in the feedback circuit to produce soft, symmetrical clipping of the input waveform.The overdrive stage is followed by a simple lowpass filter and active tone control circuit and volumecontrol. The TS7 allows switching between "TS9", with the circuit and all relevant component valuesbeing identical to the vintage model, to "Hot" mode which introduces an additional gain stage.

Much has been made of the opamp chips used in the various versions of the Tube Screamer pedal,and several articles have been written on the subject. The JRC4558D chip is particularly wellregarded. In fact, the JRC4558D is used in Analogman's "Silver" modification. Other popular chipsincluded the TL072, RC4558P, and OPA2134. The TA75558, standard in the TS10 alongside the4558, is regarded as the "ugly duckling of TS opamps."

Yet another variant was the Ibanez Super Tube that featured a fourth Bite knob which provided aharder attack.

Ibanez Tube Screamer ® History from wikipedia, accessed on 23/10/2010 inhttp://en.wikipedia.org/wiki/Ibanez_Tube_Screamer

®Ibanez Tube Screamer 808

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Ready to Transfer Layout (1:1 Scale)

Layout - Better View (1,8:1 Scale)

®Ibanez Tube Screamer 808 - Construction

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6,00 cm

6 , 0 7 c m +

Ext.DC.

1 2 3 4 5 6 7 8 9 10 111 122 133

144

-100u+ 1

N 4 0 0 3

N

4

5 1 0 K

1 0 0 n

5 1 0 K

5 1 0 K

2 S K 3 0 A

2 S K 3 0 A

1 N 4 1 4 8

1N4148

Jumper

10K10K 10K

47u-

+ 1 0 0 n

1K

1uNP

1uNP

1K

2 S C 1 8 1 5

510K

J R C 4 5 5 8

1K

10K

1K

10K

4K7

2 0 n

51p

47n

2 - 1N4148

5 1 K.22u

Tant

+

2 2 0 R

+

.22uTant

2 S C 1 8 1 5

1M

1 N 4 1 4 8

Z e n e r 4 . 7 V

100R

4 7 n

1 M

5 6 K

5 6 K

1M 4 7 n

2 S C 1 8 1 5

2 x 2SC1815

CR1CR2

10K 2 2 K

1 0 0 R

5 6 K

1 n

3K6

5 6 K

1 n

1 n62K

1M

2 2 R10K

-10u

+

Ext.DC.

1 2 3 4 5 6 7 8 9 10 111 122 133

144 -100u+ 1

N 4 0 0 3

N

4

5 1 0 K

1 0 0 n

5 1

0 K

5 1

0 K

2 S K 3 0 A

2 S K 3 0 A

1 N 4 1 4 8

1N4148

Jumper

10K10K 10K

47u

-

+ 1 0 0 n

1K

1uNP

1uNP

1K

2 S C 1 8 1 5

510K

J R C 4 5 5 8

1K

10K

1K

10K

4K7

2 0 n

51p

47n

2 - 1N4148

5 1 K.22u

Tant

+

2 2 0

R

+

.22uTant

2 S C 1 8 1 5

1M

1 N 4 1

4 8

Z e n e r 4 . 7 V

100R

4 7 n

1 M

5 6 K

5 6 K

1M 4 7 n

2 S C 1 8 1 5

2 x 2SC1815

CR1CR2

10K 2 2 K

1 0 0 R

5 6 K

1 n

3K6

5 6 K

1 n

1 n62K

1M

2 2 R10K

-

10u



+

Ext.DC.

1 2 3 4 5 6 7 8 9 10 111 122 133

144 -

100u+ N

4 0 0 3

1N

4

5 1 0 K

0 n

1 0

0 K

5 1

0 K

5 1

K 3 0 A

2 S

2 S K 3 0 A

4 1 4 8

1 N

1N4148

Jumper

10K10K 10K

47u-

+ 1 0 0 n

1K1uNP

1uNP

1K

2 S C 1 8 1 5

510K

J R C 4 5 5 8

1K

10K

1K

10K

4K7

2 0 n

51p

47n

2 - 1N4148

5 1 K.22u

Tant

+

2 2 0 R

+

.22uTant

2 S C 1 8 1 5

1M

1 N 4 1 4 8

Z e n e r 4 . 7 V

100R

4 7 n

1 M

5 6 K K

5

6

1M 4 7 n

C 1 8 1 5

2 S

2 x 2SC1815

CR1CR2

10K 2 2 K

1 0 0 R

5 6 K

1 n

3K6

5 6 K

1 n

n 1

62K

1M

R

2 2

10K

-10u


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External Connections (1,5:1 Scale)

Level100K Lin

Tone20K W

Drive500K Log

PushButton Led

OUTIN




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Parts List

Semiconductors01 - 4558 - Dual High-Gain Operational Amplifier (IC1)06 - 1N4148 - High-speed switching diodes (D101, D102, D103, D104, D105, D106) * D105 showed in schema but not used on board05 - 2SC1815 - Transistor Silicon NPN Epitaxial (Q101, Q103, Q105, Q106, Q107)02 - 2SK30A - Silicon N-Channel Junction FET (Q102, Q104)

01 - 1N4003 - General Rectifier Diode (D108)01 - 4V7/0,5W - Zener 4,7V x 0,5W (D107)01 - LED (LED1)

Resistors (All Resistors are 1/4W or 1/8W, ±5% rating)

01 - ?? - Not specified in schema (R119)01 - 22 (R124)02 - 100 (R114, R129)01 - 220 (R108)04 - 1K (R101, R107, R110, R111)

01 - 3K6 (R131)01 - 4K7 (R104)07 - 10K (R103, R105, R109, R113, R115, R132, R133)01 - 22K (R122)01 - 51K (R106)04 - 56K (R125, R126, R127, R128)01 - 62K (R121)04 - 510K (R102, R112, R117, R118)04 - 1M (R116, R120, R123, R130)

Capacitors (all ceramic capacitors are above 25V rating. All other capacitors are above 50V rating,

unless otherwise marked)

01 - 51pF - Ceramic (C104)03 - 1nF - Ceramic (C113, C114, C115)01 - 0.02µF - Polyestiren (C101)03 - 0.047µF - Polyester (C103, C110, C112)02 - 0.1µF - Polyester (C108, C111)02 - 0.22µF - Tantalum (C105, C106)02 - 1µF - Electrolytic Non Polarized (C102, C107)01 - 10µF - Electrolytic (C109)01 - 47µF - Electrolytic (C116)

01 - 100µF - Electrolytic (C117)



Parts List (Continued)

Potentiometers

01 - 20K-W (TONE)01 - 100K-B (LEVEL)01 - 500K-A (DISTORTION)

Miscellaneous

01 - 9V Baterry Clip (9V Battery)02 - CR1, CR2 (See Box)01 - DC Power Jack (Ext. DC.)01 - Stereo Jack (INPUT)01 - Mono Jack (OUTPUT)01 - Momentary Switch (S1)

Notes:

3K6 resistor can be achieved by putting two 1K8 resistors in series.51K resistors can be achieved by putting one 39K and one 12K resistors in series.510K resistors can be achieved by putting one 390K and one 120K resistors in series.51pF ceramic capacitor can be achieved by putting one 39pF and one 12pF ceramic capacitors in

parallel.0.02µF capacitor can be achieved by putting two 0.01µF capacitor in parallel.


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1nF

100k

Each one is a juntcionof a 1nF ceramic capacitor and a 100K resistor in parallel

CR1 and CR2 Construction Detail:



®Ibanez Tube Screamer 808 - Schema

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C P - 1

C P - 2

C P - 3

C P - 4

C P - 5

C P - 6

C P - 7

C P - 8

C P - 9

P a r t s i n

R e d a r e

n o t u s e d

i n P C B

D r a w n a n d v e r i f i e d o n 1 0 / 0 3

/ 2 0 1 1 , a c c o r d i n g

t o t h e o r i g i n a l T u b e S c r e a m e r S e r v i c e M a n u a l

T i t l e : T u b e S c r e a m e r T S - 8 0 8

C l o n e d B y : L e o n a r d o P l a u t z

C h o c r o n - 2 0 1 0 / 2 0 1 1



®Ibanez Tube Screamer 808 - Block Diagram

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I n p u t

B u f f e r

A m p .

H i G a i n A m p

.

& C l i p p e r

D i s t o r t i o n

T o n e C o n t r o l

A m p .

T o n e

L e v e l

B u f f e r

A m p .

A n a l o g

S w i t c h i n g

I n v e r t e r

O u

t p u t B

a t t e r y

C h e c k e r

L e d

F o o t S w i t c

h

S a

S b

S a

S b

O n

O f f

O f f

E f f e c t

N o r m a l

O n



®Ibanez Tube Screamer 808 - Adjustment Procedures

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Wave form of output

1 - Put 30mV, 1KHz sinewave into INPUT.2 - Set OVERDRIVE control, TONE control and LEVEL control fully CW.3 - Make sure wve form as shown in Fig. A.

4 - Set OVERDRIVE control fully CCW.5 - Make sure wave form as shown in Fig. B.

6 - Set OVERDRIVE control fully CW ant TONE control fully CCW.7 - Make sure wave form as shown in Fig. C.

8 - Set OVERDRIVE control fully CCW.9 - Make sure wave form as shown in Fig. D.

Fig. A.

Fig. B.

Fig. C.

Fig. D.



Led not Working

No Output Led Lamp Battery

Analog Switch / Driver (CP-6, 7, 8)

BatteryBattery Checker

Q107, D107

Power Supply (CP-1,2) Power Supply (D108)

Buffer Amp (CP-3) Buffer Amp (Q101)

Hi Gain Amp &Clipper (CP-4)

Hi Gain Amp &Clipper (IC101)

Tone Control Amp(CP-5)

Tone Control Amp(IC101)

Buffer Amp (CP-9) Buffer Amp (Q103)

Analog Switch / Driver (Q102, 104 - 106)

OK

NG

®Ibanez Tube Screamer 808 - Trouble Shooting

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®Ibanez Tube Screamer 808 - Wave Form at CP’s

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R e m

a r k : S i g n a l o f C P i s t h e w a v e

I n p u

t t i n g a s i n e w a v e s i g n

a l t o i n p u t

V : V o l t a g e

S : S i g n a l

S

S

S

S

C P - 1

C P - 2

C P - 3

C P - 4

C P - 5

C P - 6

C P - 7

C P - 8

V

V

9

4 , 5

V

E . O

N

N o r m a l

5 , 5

0 , 5

V

E .

O N

N o r m a l

0 , 5

5 , 5

S C P - 9

Tube Screamer TS-808 Clone Plaudddtz

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