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

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Wolfgang:
... in European terms this is the PL519, a powerful sweep often used in linear HF amps.
Quite robust.

Please tell how many mA you need at 500V, because this determines the size of the pass tube(s).

TERRA Operative:
Cool, I'll check it out.

The article in the OP rates the PSU at 100mA, but the transformer I'll use is good for 200mA (Hammond 374BX)

Wolfgang:
... OK, so we have to live with 3 tubes (PL519 assumed). One tube can dissipate ca. 35W, assuming we have about 700V of raw rectified voltage we dissipate 70W at 100mA into a short circuit. 3 tubes are safe, with 105W maximum. You will need a fan anyway ...

TERRA Operative:
Is it easy to add a few more tubes to get closer to the 200mA rating of the transformer, or is there a limitation that caps it at 3 tubes?

schmitt trigger:
I have seen HV PSUs built with a 6550 tube, far more powerful than a 6AQ5.

The 0A2 regulator tubes have a really nice glow, hope that you can find them. Last time I checked they were in short supply...but you can always go to Akihabara.

EDIT: There is a note on the schematic: SD1 and SD2 are shown in reverse polarity. Mount opposite way.

The way I see it, the diodes are oriented correctly, they are generating a negative voltage for V4's grid. Anyone has a different opinion?

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