The words Tube Driver are marked with a TM, as the tredemark registration had not gone through yet. He owns one of the first Tube Drivers made by Butler, which is marked Chander Electronics - Patent Pend. The good news is, even if you want to experiment with NOS tubes (and I think it's probably overkill in this application), you can get great NOS 12au7s for $15-$35. Four different Tube Drivers have been seen in his recording studio. I actaully have an old black plate, a Sylvania IIRC in mine, it just happened to be the only 12au7 I had lying around when I first swapped out the stock 12ax7. I agree with others, in my experience a 12au7 is much better than a 12ax7 in the circuit - the distortion is less fizzy and bright, and you have a more usable range of distortion adjustment. It's different from a twin triode that's actually doing the heavy lifting of a first preamp gain stage. I wonder if you can really hear much difference between one 12ax7 and another under those circumstances. It's a starved plate design, meaning the tube is running at low voltage, not at it's normal operating voltage, and the tube comes after the op-amp gain stage, working more like the clipping diodes in a typical solid state OD. I'm not sure you need to spend a lot of time or money looking for a special tube for the Tube Driver.
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