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Ibanez Tube Screamer 808
History
The Ibanez Tube Screamer is an overdrive pedal. The most popular use of a tube screamer is to
push a tube amp to make it overdrive more. The pedal has a characteristic mid-boosted tone
popular with blues players. The "legendary" Tube Screamer has been used by guitarists such as
Stevie Ray Vaughan to create their signature sound, and is one of the most popular and most
copied 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-volume
type tube amplifier, this can result in much higher volumes than before the pedal is engaged if the
preamp is not already turned up fairly high. Provided the preamp gain is already turned up, the Tube
Screamer 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 of
distortion, the tone knob adjusts the amount of treble in the sound, and the level knob controls the
output volume of the pedal. The pedal can be used on a solid-state amp to try to mimic the sound of
a vintage tube amp, although many guitarists prefer to use it to push a tube amp's pre-amp into an
overdriven state. The classic Tube Screamer sound includes a "mid-hump," which means that the
circuit accentuates frequencies between the bass and treble ranges (mid-frequencies). Many
guitarists prefer this sort of equalization, as it helps to keep their sound from getting lost in the
overall 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 TS808 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. Some
musicians 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 the
seventies and eighties, produce their own version of the Tube Screamer. In addition, many of the
most highly-regarded overdrive pedals, both mass-manufactured and boutique, owe their heritage
to 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
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Ibanez Tube Screamer 808
Design
Mr. S. Tamura, the designer of the Tube Screamer, used a subtle clipping circuit to create the
pedal'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 threshold
of clipping.": In this fashion, it preserves the "original dynamics of the input signal [and] avoids
muddiness 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 at
both the input and the output. The overdrive is produced using a variable gain op-amp circuit with
matched 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 volume
control. The TS7 allows switching between "TS9", with the circuit and all relevant component values
being 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 well
regarded. In fact, the JRC4558D is used in Analogman's "Silver" modification. Other popular chips
included the TL072, RC4558P, and OPA2134. The TA75558, standard in the TS10 alongside the
4558, 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 a
harder attack.
Ibanez Tube Screamer ® History from wikipedia, accessed on 23/10/2010 in
http://en.wikipedia.org/wiki/Ibanez_Tube_Screamer
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Ibanez Tube Screamer 808 - Construction
6,00 cm
1N4003
Ext.DC.
14
1N4003
9
2SC1815
10K
51K
220R
47n
4K7
51p
+
47n
1M
1K
1K
1K
1u
NP
1u
NP
+47u1K
-
10K 10K
10K
10K
510K
10K
Layout - Better View (1,8:1 Scale)
2SC1815
2SC1815
.22u
Tant
Jumper
20n
2 - 1N4148
.22u
Tant
1N4148
+
2SC1815
+47u1K
10 11 12 13
100n
510K
100n
1u
NP
1u
NP
10K 10K
10K
10K
510K
100n
56K
47n
1K
100u
1M
56K
56K
56K
Zener 4.7V
56K
1n
1n
1M
CR2
1N4148
2SK30A
8
+
100R
2SK30A
22K
47n
1N4148
7
6
3K6
CR1
2 x 2SC
1815
10K
510K
510K 2SC1815
5
4
1n
22R
62K
100R
+
10u 1M
20n
220R
1N4148
56K
Zener 4.7V
56K
1n
56K
1K
+
Jumper
JRC4558
10K
3
4K7
1K
Layout (1:1 Scale)
14
2
47n
51p
Ext.DC.
1
2 - 1N4148
.22u
Tant
1M
2SK30A
2SK30A
510K
100n
1N4148
+
10 11 12 13
.22u
Tant
1M
47n
1N4148
CR2
1M
9
+
1n
22R
CR1
2 x 2SC
1815
10K
22K
510K 2SC1815
8
100R
1n
62K
Ready to Transfer
7
6
3K6
10u 1M
100R
+
5
4
510K
6,07 cm
10K
3
51K
2
JRC4558
1
100u
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Ibanez Tube Screamer 808 - Construction
Drive
500K Log
Level
100K Lin
Led
OUT
Ext.DC.
1
1N4003
N4003
IN
14
4K7
51p
1K
+
1K
+47u1K
-
10K 10K
10K
1u
NP
1u
NP
1K
10K
510K
2SC1815
2SC1815
47n
20n
51K
47n
220R
1N4148
56K
Zener 4.7V
2 - 1N4148
.22u
Tant
1M
56K
56K
+
10 11 12 13
100n
510K
2SK30A
9
.22u
Tant
Jumper
2SK30A
22K
47n
1N4148
1M
CR2
1N4148
510K
8
+
100R
CR1
2 x 2SC
1815
10K
100n
510K 2SC1815
7
6
3K6
1n
62K
5
4
1M
10u 1M
100R
+
22R
10K
3
56K
1n
2
1n
1
100u
JRC4558
Push
Button
Tone
20K W
10K
External Connections (1,5:1 Scale)
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Ibanez Tube Screamer 808 - Construction
Parts List
Semiconductors
01 - 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 board
05 - 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)
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Ibanez Tube Screamer 808 - Construction
Parts List (Continued)
Potentiometers
01 - 20K-W (TONE)
01 - 100K-B (LEVEL)
01 - 500K-A (DISTORTION)
Miscellaneous
CR1 and CR2 Construction Detail:
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)
Each one is a juntcion
of a 1nF ceramic capacitor
and a 100K resistor in parallel
1nF
100k
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.
CP-2
CP-1
CP-3
CP-4
Parts in Red are
not used in PCB
CP-8
CP-9
Cloned By: Leonardo Plautz Chocron - 2010/2011
Title: Tube Screamer TS-808
Drawn and verified on 10/03/2011, according
to the original Tube Screamer Service Manual
CP-5
CP-7
CP-6
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Ibanez Tube Screamer 808 - Schema
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Input
Buffer
Amp.
Hi Gain Amp.
& Clipper
Distortion
Effect
Normal
Sa
On
Off
Tone Control
Amp.
Tone
Sb
Off
On
Level
Sb
Sa
Output
Foot Switch
Analog
Switching
Inverter
Buffer
Amp.
Battery
Checker
Led
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Ibanez Tube Screamer 808 - Block Diagram
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Ibanez Tube Screamer 808 - Adjustment Procedures
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.
Fig. A.
4 - Set OVERDRIVE control fully CCW.
5 - Make sure wave form as shown in Fig. B.
Fig. B.
6 - Set OVERDRIVE control fully CW ant TONE control fully CCW.
7 - Make sure wave form as shown in Fig. C.
Fig. C.
8 - Set OVERDRIVE control fully CCW.
9 - Make sure wave form as shown in Fig. D.
Fig. D.
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Ibanez Tube Screamer 808 - Trouble Shooting
No Output
Led Lamp
Battery
Led not Working
Battery
Battery 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)
Analog Switch / Driver
(CP-6, 7, 8)
Analog Switch / Driver
(Q102, 104 - 106)
Buffer Amp (CP-9)
Buffer Amp (Q103)
OK
NG
CP-2
V
4,5
CP-1
V
9
S
CP-3
S
CP-4
S
CP-5
Remark: Signal of CP is the wave
Inputting a sine wave signal to input
S
CP-6
5,5
E. ON
V
0,5
Normal
CP-7
0,5
E. ON
V
5,5
Normal
CP-8
S
CP-9
V: Voltage
S: Signal
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Ibanez Tube Screamer 808 - Wave Form at CP’s
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Ibanez Tube Screamer 808 - Boards
Ready to Transfer