The Mosvalve power amps are really underrated for their price as well. I see someone in my area is selling the rack version of this with the Mosvalve Power Amp (which is built into the combo) for $250. Looks like this unit works with bipolar low voltage supply as the Tube Driver that were constructed after this line of pedals. Harmony in to have a Burger King near you get tube. Tube Works BK Butler Real Tube Overdrive has a 12ax7 tube inside instead of transistors to drive the amp. I'm more just leaving this out there for any TGP reader that sees a good deal on one of these. The 1985 BK Butler tube driver pedal is a rack. I'd had a Chandler Tube Driver (BK Butler designed these but some of them deviate slightly from his design) previously which I didn't like as much but had only ever used the stock AX7 in that. I'm not the only one to think this and that's pretty much why I bought (i.e., it was a good deal and I wanted to try it with a tube swap). The Telefunken AT7 I put made it sound warmer, smoother, and a lot less gain-y. I'm not going to tell you to go try another one just to prove me right/wrong but if you have happened upon on a good deal on one (pedal, combo, or rack) on the Tube Drivers and less gain is your thing consider swapping it out for an AU7 or AT7. For me, the key to getting a good tone out of these is swapping out the tubes.
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