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?
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.
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.
Tungar tubes were made for this. If you use vacuum diodes, if you can make it work, you will have close to 0% efficiency.
http://www.r-type.org/pdfs/tungar.pdf
I agree with Eli. Use solid state.
LM317/LM337 with work...
http://www.r-type.org/pdfs/tungar.pdf
I agree with Eli. Use solid state.
LM317/LM337 with work...
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Funny how this same question comes up every few months. The answer is the same: don't do it, it is daft.