• 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.

Tube Phono Preamps

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I have a project that will have a 500V B+ supply available so dropping some volts on a regulator would be no hardship. I was thinking that an active regulator will require a bit more intelligence on my part which adds to the interest. There does seem to be extra brownie points for using a shunt regulator vs series - thoughts ?

Don't forget that Mr. Blencow showed us how to use the top tube grid to get around 30dB of PSRR from a Cascode. It's not enough by itself but a better place to begin.
 
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