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In Reply to: RE: "Those discs are just cosmetic" posted by 1973shovel on October 26, 2020 at 09:26:38
I have no idea if the circuit in question is truly tubed. However, it's easy enough to get the 250 VDC or so needed for B+. Voltage multiply that 18 VAC.
The attached 1/2 wave parallel setup would certainly take care of the few mA. 4X 12AX7 sections draw. Even the less efficient Cockcroft-Walton configuration might be good enough.
Eli D.
Follow Ups:
The PS input to the unit is 18vdcMy guess, they're just running the 12ax7 at super low plate voltages like a lot of guitar effects boxes do.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 10/29/20
As I just responded to Tre', the last time this issue came up no one had any suggestions, so I was left wondering if the low voltage might do nothing more than light the heaters for listening room tube glow.
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