Electronics > Projects, Designs, and Technical Stuff

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

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001:

--- Quote from: KD4CCF on February 27, 2019, 02:10:58 pm ---For vintage stuff, it's often better to buy then recreate. 
Check out Heathkit IP-17 and IP-32  power supplies on ebay.

--- End quote ---

This is normal only for US customers.
Abroad, we can build a new one for the cost of delivery

001:

--- Quote from: Wolfgang on February 23, 2019, 10:32:23 pm ---Hi,

sorry for no progress, but still searching the web for some realistic tube SPICE models.

Wolfgang

--- End quote ---

How are You?

Wolfgang:
Hi,

I got some models now (PL519 with grid currents) but they need to be tried out before I can recommend them.
Some other tasks got in the way as well, so I apologize for the delay.

regards
  Wolfgang

artag:
I've got a Kepco HB525 similar to  https://www.georgia-market.com/LaGrange-/Electronics-/Kepco-hb-regulated-dc-power-supply-HB4AM.asp (not that actual one, it's not my advert) which is probably a pretty decent commercial example of this sort of thing. I can copy the schematic if useful, as Kepco kindly sent me a free copy of the manual (5* for Kepco !). 500V, 500mA, 0.01% line & load regulation, 1mV ripple, 2 x 10A aux heater supplies.

The only downside (ok, apart from the weight, it's pretty much 100% transformium) is that it's supposed to have 5 GE 7581 tetrodes as the output devices. These, together with similar like the KT66 are prime audio valves and so rather expensive. I currently have a couple of battered 6l6 in there which keeps it well below rated output.

So I really want to find some good quality 7581 equivalents which are, for whatever reason, disliked by the golden ear brigade. Maybe russian ? Or I could try substituting some suitable FETs but that's heresy, right ? Any suggestions ?

 

schmitt trigger:
At least it doesn't require any NOS genuine W-E 300B tubes.  >:D

https://www.ebay.com/itm/ONE-Western-Electric-300b-NOS-1940S-Pre-WWll-production-FREE-S-H-ANYWHERE/142976348376?hash=item214a0df0d8:g:NWsAAOSwIrVbT8jG

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