capacitorless
Well-known member
I've got a tube guitar amp that I would like more B+ out of (to use a different power tube), and without changing the power transformer. I'm definitely not ruling that out, but want to use what I have if practical. The other secondary voltages should remain the same: 2 different filament supplies, and 5vac for a rectifier. I can't use the supplied alternate 100v primary winding (not shown) without side effects - grrr.
In a nutshell, I know that a Zener diode in the center tap circuit can be used to decrease B+, and a standby switch can be wired in the center tap like it is in the attached schematic.
My question is simply: could I add (say) 30v dc to the center tap, and thusly bring up the rectified voltage by the same amount? Basically the secondary would be 30vdc plus 265vac riding on top, if my thinking is correct.
I've not seen this done before. I would initially use a bench supply, then something like a SMPS (reliability concerns aside) if I wanted more permanence. Any takers?
In a nutshell, I know that a Zener diode in the center tap circuit can be used to decrease B+, and a standby switch can be wired in the center tap like it is in the attached schematic.
My question is simply: could I add (say) 30v dc to the center tap, and thusly bring up the rectified voltage by the same amount? Basically the secondary would be 30vdc plus 265vac riding on top, if my thinking is correct.
I've not seen this done before. I would initially use a bench supply, then something like a SMPS (reliability concerns aside) if I wanted more permanence. Any takers?
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