However, the DRIVE control is controlling an op amp distortion stage with loads of drive. I know there are a lot of talented people who do layouts on here and don't know if anyone is tackling this already or not. I understand they are out of production and most people say the original BK Butler Is the one to have not the Chandler version. This pedal does indeed include a real 12AX7 tube inside the enclosure. I am looking for a pcb to build a BK Butler Tube Driver. Butler reissue of the 911 Tube Driver from 2006. Also, the "P" stands for an on-board phaser. Schematic image found in the (expired) U.S. Shown above (left to right) - The 1985 BK Butler Tube Driver, the revised 1986-87 BK Butler Tube Driver, the unauthorized 1988 knockoff made by Chandler after Butler parted ways with them, the 1990s Tube Works 911 Tube Driver, and a B.K. The first version only ran from 1978-79, the second version ran from 1980 until the company went bankrupt in 1984. There are actually a couple of different RPs depending on the year some are 65 watts, others are 100 watts.
The old Music Mans were hybrid amps - they have a solid state preamp with a tube power amp - the exceptions being the earliest models which did have some tubes in the preamp and that RD50 series that I had (the RD50s were single-channel amps that had a single preampt tube in the gain channel that was kind of like having a BK Butler tube driver inside the amp).
The core of the pedal is a hand-selected 12AX7 tube - which gives you a lovely sort of fuzz-drive sound than can sound amazingly smooth and textured in the hands of masters like David Gilmour - who still. Butler Tube Driver famously used by David Gilmour, Eric Johnson, Billy Gibbons and Joe Satriani to name a few. Fuzz Fuzz-Drive and Fuzzstortion Fuzzrocious Hermida Lovepedal MXR Overdrive TC Electronic Tube Overdrive. Not the same model, but I would agree with Mpcoluv that they are in the Fender realm. BK Butler Boost and Overdrive Buffalo FX. Powered by an 12au7 vacuum tube, the Valvecaster. The blues driver is a decent cheap substitute. The skreddy screwdriver is probably a good option too, though it is much more costly and not as easily available. A few years ago someone asked me to build a Valvecaster-type tube overdrive pedal. If you amp is EQd more evenly, a modded Boss Blues Driver can do a quite convincing impersonation of the Butler lower-gain sounds. With tube overdrive pedals, its important to understand that most of them run the (original circuit), the Fulldrive 2 (similar to the TS), BK Butler Tube Driver. I got mine new in the summer of 1981 and kept it until I quit playing in 1986 (I returned to playing in 1992). diodes can create a more tube-like asymmetric. My first "good" amp was a Music Man RD50 -112 - which was their last amp model designed in 1981.