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Is it possible to make a +/- 12V DC Valve psu for multi channel preamp

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rhythmsandy

Member
Joined 2012
Im planning to build a multi channel preamp / buffer where the current consumption is in the order of max 150ma for all channels and active crossovers in it. I was thinking to power it up with a valve supply. Instead of 330V DC output can we get much lower output voltage like +/-12V? 200ma?
 
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Eli Duttman

Member
Joined 2004
It's possible, but even with damper diodes you have forward drop roughly as large as the rail voltage. :( How are you going to regulate the resulting rails? About the only thing that avoids "sand" is choke I/P filtration.

JMO, the time to use "hollow state" devices is when they do a better job than SS devices. in this situation, a CT rectifier winding feeding 4X Schottky diodes and 2 filter caps, along with 7812/7912 3 terminal regulator ICs seems to be an obvious choice.
 
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