I finally got around to documenting this HV bench supply that I designed and built a while ago...
Details, schematics, etc. are here:
http://www.pmillett.com/HV_bench_supply.htm
Pete
Newbie question: I'm considering building this, and my B+ transformer on-hand is good for 360V@160ma.
Can I use less pass tubes? I'm assuming that these are paralleled to allow for Pete's 500ma current requirement.
I have a handful of Chinese 6L6GC's. If I can reduce the number of tubes to say 2 or 3, does anything else need tweaking?
Can I use less pass tubes? I'm assuming that these are paralleled to allow for Pete's 500ma current requirement.
I have a handful of Chinese 6L6GC's. If I can reduce the number of tubes to say 2 or 3, does anything else need tweaking?
I got a commercial one that goes to 1000VDC @ 200MA. Measures volts, current and computes watts. It's got a digital display. Very kool but it kicks out the overload breaker or frys the voltage control pot (5K) randomly. When I get around to it I'll start with replaceing all the caps otherwise it's got too many sand state components for my meager brain. I'll have to get it fixed. I hope it's KVA rated. Like 500VDC at 400MA? That would be nice. It's a piece of medical equipment used in DNA testing or research. I have not been able to find a scheme.
Someone brought up thyratrons in another thread. You should make one with some -- who needs pass tubes except for ripple attenuation? Much better efficiency with switching. And hey, if you still need low ripple, you could add a hum bucker to cheat on the inductors and capacitors needed to kill the hum.
Instead of a voltage doubler, put in a voltage tripler in your Heath (Eico, Genrad etc.)
Of course, I don't know whether the 6L6's will be happy...
Any of you lucky enough to own one of these bad boys?
http://tubedata.milbert.com/sheets/077/1/1257.pdf
Because I do =)
Why is it that no one has used something like an 811A as a pass tube? The rest of the regulator could easily be sand...
UH, if you have to ask, you can't lift it!
I has a big tube with battery cables hanging out of the bottom. It was about 2 feet tall and I couldn't even light the heater without smoking a transformer, so it and a whole pickup truck full of thyratrons were sold for $200.
I have 3 different 400 volt supplies. Those were limiting my fun so I found a Fluke 407D for cheap on Ebay. There are rated for 555 volts at 300 Ma. I routinely bury the meter needle and it hasn't blown up yet. It still has the original tubes and caps in it. After about 4 years, I wanted more juice, so...
Yeah, thats the ticket. Rated for 600 volts at 1.5 amps, mine goes to 650 volts and 1.7 amps. I have not yet needed more power than this thing puts out. In fact I think my wall outlet is now the limiting factor since I have blown the breaker twice. I have used this guy to squeeze 200 WPC out of Petes red board. Photo shows the HP warming up some 6KD6's. 500 volts at 1.6 AMPS! Thats 800 watts going into the board. A little over 400 watts are comming out!
Just for fun I connected the power supply up to a dead 6AX4......Guess who won that battle.
Attachments
I bought two electrophoresis supplies from sellers that claimed they worked. I couldn't get anything out of either one. There stashed in the warehouse somewhere, likely to be scrapped the next time I get over there.
Early on I used a variac, a 480 volt industrial transformer, a bridge rectifier, and a big cap to make a 0 to 650 volt 10 amp power supply. it was unregulated, but quite useful. The very large transformers that I used made the whole unit weigh about 100 pounds, so it wound up in the warehouse.
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