ibanez tube screamer - handmades screamer ts-… · the ibanez tube screamer is an overdrive pedal....
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© PDF by Plautz
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 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. 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
®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
®Ibanez Tube Screamer 808
© PDF by Plautz
Ready to Transfer Layout (1:1 Scale)
Layout - Better View (1,8:1 Scale)
®Ibanez Tube Screamer 808 - Construction
© PDF by Plautz
6,00 cm
6,0
7 c
m
++
Ext.DC.
11 22 33 44 55 66 77 88 99 1010 1111 1212 1313
1414 -100u++1
N4
00
31
N4
00
3
51
0K
10
0n
51
0K
51
0K
2S
K3
0A
2S
K3
0A
1N
41
48
1N4148
Jumper
10K10K 10K
47u-
++
10
0n
1K
1uNP
1uNP
1K
2S
C1
81
5
510K
JRC4558
1K
10K
1K
10K
4K7
20
n
51p
47n
2 - 1N4148
51
K.22uTant
++
22
0R
++
.22uTant
2S
C1
81
5
1M
1N
41
48
Ze
ne
r 4
.7V
100R
47
n
1M
56
K
56
K
1M
47
n
2S
C1
81
5
2 x 2SC1815
CR1CR2
10K
22
K
10
0R
56
K
1n
3K6
56
K
1n
1n62K
1M
22
R10K
-10u
++
Ext.DC.
11 22 33 44 55 66 77 88 99 1010 1111 1212 1313
1414 -100u++1
N4
00
31
N4
00
3
51
0K
10
0n
51
0K
51
0K
2S
K3
0A
2S
K3
0A
1N
41
48
1N4148
Jumper
10K10K 10K
47u-
++
10
0n
1K
1uNP
1uNP
1K
2S
C1
81
5
510K
JRC4558
1K
10K
1K
10K
4K7
20
n
51p
47n
2 - 1N4148
51
K.22uTant
++
22
0R
++
.22uTant
2S
C1
81
5
1M
1N
41
48
Ze
ne
r 4
.7V
100R
47
n
1M
56
K
56
K
1M
47
n
2S
C1
81
5
2 x 2SC1815
CR1CR2
10K
22
K
10
0R
56
K
1n
3K6
56
K
1n
1n62K
1M
22
R10K
-10u
++
Ext.DC.
11 22 33 44 55 66 77 88 99 1010 1111 1212 1313
1414 -100u++
N4
00
31
N4
00
31
51
0K
0n
10
0K
51
0K
51
K3
0A
2S
2S
K3
0A
41
48
1N
1N4148
Jumper
10K10K 10K
47u-
++
10
0n
1K
1uNP
1uNP
1K
2S
C1
81
5
510K
JRC4558
1K
10K
1K
10K
4K7
20
n
51p
47n
2 - 1N4148
51
K.22uTant
++
22
0R
++
.22uTant
2S
C1
81
5
1M
1N
41
48
Ze
ne
r 4
.7V
100R
47
n
1M
56
K K5
6
1M
47
n
C1
81
52
S
2 x 2SC1815
CR1CR2
10K
22
K
10
0R
56
K
1n
3K6
56
K
1n
n162K
1M
R2
2
10K
-10u
®Ibanez Tube Screamer 808 - Construction
© PDF by Plautz
External Connections (1,5:1 Scale)
Level100K Lin
Tone20K W
Drive500K Log
PushButton
Led
OUTIN
®Ibanez Tube Screamer 808 - Construction
© PDF by Plautz
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.
®Ibanez Tube Screamer 808 - Construction
© PDF by Plautz
1nF
100k
Each one is a juntcionof a 1nF ceramic capacitorand a 100K resistor in parallel
CR1 and CR2 Construction Detail:
®Ibanez Tube Screamer 808 - Schema
© PDF by Plautz
CP
-1
CP
-2
CP
-3
CP
-4C
P-5
CP
-6
CP
-7
CP
-8
CP
-9
Pa
rts in
Re
d a
ren
ot u
se
d in
PC
B
Dra
wn
an
d v
eri
fied
on
10/0
3/2
011, acco
rdin
gto
th
e o
rig
inal Tu
be S
cre
am
er
Serv
ice M
an
ual
Title
: Tu
be S
cre
am
er
TS
-808
Clo
ned
By: L
eo
nard
o P
lau
tz C
ho
cro
n -
2010/2
011
®Ibanez Tube Screamer 808 - Block Diagram
© PDF by Plautz
Inp
ut
Bu
ffe
rA
mp
.H
i Ga
in A
mp
.&
Clip
pe
r
Dis
tort
ion
Ton
e C
on
tro
lA
mp
.Ton
e
Le
vel
Bu
ffe
rA
mp
.
An
alo
gS
witc
hin
gIn
ve
rte
r
Ou
tpu
t Ba
tte
ryC
he
cke
r
Le
d
Fo
ot S
witc
h
Sa
Sb
Sa
Sb
On
Off
Off
Effe
ct
No
rma
lO
n
®Ibanez Tube Screamer 808 - Adjustment Procedures
© PDF by Plautz
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
© PDF by Plautz
®Ibanez Tube Screamer 808 - Wave Form at CP’s
© PDF by Plautz
Re
ma
rk: S
ign
al o
f C
P is
th
e w
ave
Inp
uttin
g a
sin
e w
ave
sig
na
l to
inp
ut
V: V
olta
ge
S: S
ign
al
SS
SS
CP
-1C
P-2
CP
-3C
P-4
CP
-5C
P-6
CP
-7C
P-8
VV
94
,5
V
E. O
NN
orm
al
5,5
0,5
V
E. O
NN
orm
al
0,5
5,5
S
CP
-9
®Ibanez Tube Screamer 808 - Boards
© PDF by Plautz
Ready to Transfer
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