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Planning to build benchtop 500V tube PSU, help needed.

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artag:
 :-DD

chris_leyson:
There is always this monster http://www.pmillett.com/HV_bench_supply.htm with 807's !!

romhunter:

--- Quote from: chris_leyson on April 10, 2019, 09:48:14 pm ---There is always this monster http://www.pmillett.com/HV_bench_supply.htm with 807's !!

--- End quote ---

I'm just suprised no one mention this design. I've been collecting parts to make it for a year. Just a few relays and a choke to go. 807's are cheap, those error amp tube and voltage reference tube can also be source (new tube, thank to Ukraine manufacturer).

And there's another design: https://www.novotone.be/projets/alimentation-ht-de-laboratoire-gamme-de-50-a-450-v-500-ma, this one does not use any tubes.

coromonadalix:
the two previous posts are nice projects ...

you had the isco 493  and 494  hacked modded on the web ...  a thread there :

https://www.diyaudio.com/forums/tubes-valves/81992-isco-494-a-2.html

H713:
Nice project- I'm (very slowly) designing a purely solid state power supply (but to be used for the same purpose) simply do to space requirements. But I will say- doing it with tubes is easier, I just have space limitations.

If you want to go really 1970s with this, you could minimize how much heat is dissipated in the pass tubes by using a variac that is controlled by a servo motor depending on your output voltage and current to minimize drop across the series pass elements. Where I work we have some power supplies that can do up to 800A at 200V. They use 21 (its 3-phase) variacs (big ones) controlled by a sort of servo motor to keep the (something like 260) liquid-cooled pass transistors in their safe operating area. Something like this on a smaller scale could work nicely, although it is a bit crude.

If you're looking for a power transformer, I've used these Antek toroidals and found that they're pretty hard to beat for the money. Making them look nice on top of a tube amp can be a bit of a pain, but if you put it in a rackmount enclosure they're pretty nice.
http://www.antekinc.com/


One advantage to solid-state diodes is that you can use very large filter caps without worrying about the tube arcing and sparking.

Also, regarding the Heathkit, I would be willing to bet that the reason they used the 6X4 is because they had a lot of them in stock. Heathkit sold plenty of other kits back in the day, and a lot of the parts in that power supply are slightly odd choices and look suspiciously like they were originally specced for other equipment.

Just my $.02

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