Tubulation II PUBLIC

Tubulation II: High-gain Distortion Circuit w. Fuzz & Distortion.

Largely the same as the original Tubulation: High-Gain Distortion circuit, but with a different 3-band tone-control circuit, re-adjusted part-values, and different control labels. Controls Include: Input Gain, Clean Level, Fuzz Gain, Distortion Drive, Fuzz + Distortion Gain, Fuzz + Distortion Tone, Fuzz + Distortion Trim, Bass, Mid, Treble, and Output Gain. The original Fenter-style tone-stack has been replaced by a Baxandall tone-control with mid control added. As with the first Tubulation circuit, the Fuzz is obtained from overdriven depletion-mode MOSFETs while Distortion is from overdriving two CMOS op-amps, though the MOSFET IC can be replaced by a 12AX7A preamp tube; with directions given at the bottom of the diagram. Frequency range between the -3 dBV corners and with all controls at 50% is from 10 Hz to 33 kHz. The most usable range is from 40 Hz to 6.3 kHz, while mids between 100 Hz and 1 kHz is flat at +24 dBV, with all controls at 50%. Circuit is therefore suitable for 6/7/8-string guitar and 4/5/6-string bass. Maximum gain = +24 dBV with all controls at 50%, or +44 dBV @ 1.6 kHz with all controls at 100%, and at which the range extends from 10 Hz to 100 kHz. The battery should be replaced by a regulated +12V DC power-supply. Also, treat the circuit as experimental in nature. Breadboard test before committing to a soldered build.