| Electronics > Projects, Designs, and Technical Stuff |
| Planning to build benchtop 500V tube PSU, help needed. |
| << < (6/19) > >> |
| 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? |
| Navigation |
| Message Index |
| Next page |
| Previous page |