• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Help needed lowering B+ for DIY amp

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jrdmedford

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Joined 2004
You could also use a SECOND rectifier tube to get an additional 30 - 50V drop if you really want to tackle the problem this way. Do you have enough filament current supply to drive a second filament?

I'd just adjust the circuit for a higher B+. You'd put slightly larger plate resistors on the 12AX7s. You could use KT66s instead of 6L6.

-- Jim
 
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