Ha. crazy -Putting a passive transducer with a 50C temp onboard tube preamp inside a custom guitar -honestly think about it.....
if his special pickup is so sensitive and low of an output before the tube circuit that he needs the pre adjacent like a tube recording mic, wouldn't it make a whole lot of sense instead to put a super transparent solid state preamp into the guitar just enough to get it 20 ft from the guitar to then process it through the robust tube circuitry? or even passive circuitry would allow you a higher gain through the tube circuit? then your market would be EVERYONE -or even drop the level again at the tube circuit and reproc it back up to guitar line level with the tube circuit if you think the magic is not in the circuit, but instead the gain stepping through the circuit.
Seems like an implausible amount of trouble to achieve something, but I guess I'd need to hear A/Bs -but many settings (especially the first few) were not the warm tube sound I was expecting but rather a bit thin with razor sharp attack that sizzle to me.
I'd love to hear this in person, I love that he tried this but wow.... lots of issues with this ever being anything other than a one off.
What a neck on that guitar eh?