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

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TERRA Operative:
Quick bump to let you guys know this is still happening... :)

Got pretty much all the parts needed (pending final tube choices) except the enclosure (which I'll choose once I know the size I need) and the power transformer and 12H inductor, which I can get from Digikey.

Transformer - https://www.digikey.com/products/en?keywords=hm5128-nd
Inductor - https://www.digikey.com/products/en?keywords=hm4779-nd


Problem is that after the Christmas expenses (airfares and all), I just blew this months allowance on a Tek 577-177 curve tracer, so I'll have to wait a bit to save up my pennies for those last bits.


Anyway, here's a pic of the stuff I have so far. :)

coppercone2:
How much cooler does the vacuum insulated part of the tube get when the tube is cooled from envelope reradiation?

Is it possible to measure temperature of the structure with a built in rtd to regulate heater power rather then to cool the tube?

ArthurDent:
I’ve made some adjustable D.C. power supplies in the past using triodes as the pass element. On the larger supplies I used 6080WA or 6336 tubes. Here are some photos of a small 150-250VDC 100Ma supply I made ages ago that worked pretty well. 

What I’m using now is an electrophoresis power supply made by Bio-Rad that is somewhat similar to the one pictured below. These sell on eBay generally for less than $100. The one pictured has 2 voltage ranges of 250/500VDC and 2 current ranges of 50/500Ma. I needed one a little different so the one I bought has digital meters and goes up to 1Kv.

001:

--- Quote from: ArthurDent on February 09, 2019, 03:32:53 am ---I’ve made some adjustable D.C. power supplies in the past using triodes as the pass element. On the larger supplies I used 6080WA or 6336 tubes. Here are some photos of a small 150-250VDC 100Ma supply I made ages ago that worked pretty well. 

What I’m using now is an electrophoresis power supply made by Bio-Rad that is somewhat similar to the one pictured below. These sell on eBay generally for less than $100. The one pictured has 2 voltage ranges of 250/500VDC and 2 current ranges of 50/500Ma. I needed one a little different so the one I bought has digital meters and goes up to 1Kv.

--- End quote ---

Thanx for great info!
Can You post schematics of this units or correct model numbers to google it?

TERRA Operative:

--- Quote from: ArthurDent on February 09, 2019, 03:32:53 am ---Here are some photos of a small 150-250VDC 100Ma supply I made ages ago that worked pretty well. 

--- End quote ---

Looks cool!
Don't tease us though! You got any schematics? :)

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