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© PDF by Plautz ® 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 © PDF by Plautz ® 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 © PDF by Plautz ® 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 © PDF by Plautz ® 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) © PDF by Plautz ® 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) © PDF by Plautz ® 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 © Ibanez Tube Screamer 808 - Schema ® PDF by Plautz 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 © Ibanez Tube Screamer 808 - Block Diagram ® PDF by Plautz © ® PDF by Plautz 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. © PDF by Plautz ® 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 © Ibanez Tube Screamer 808 - Wave Form at CP’s ® PDF by Plautz © ® PDF by Plautz Ibanez Tube Screamer 808 - Boards Ready to Transfer