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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: I have biased tubes in the past above true ground but. . posted by John PA on October 22, 2024 at 09:38:58:
Do not otherwise ground the DC filament supply. It will be grounded by this resistor network.
The combined resistor values of R2, P1 and R3 (in series) is in parallel with the filament so that will be an extra load on the filament supply.
Make R5 whatever value it needs to be, vs. the cathode current, to give 20 volts of cathode bias for the tube.
Tre'
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Follow Ups
- RE: I have biased tubes in the past above true ground but. . - Tre' 07:42:26 10/26/24 (3)
- RE: I have biased tubes in the past above true ground but. . - PakProtector 08:39:46 10/29/24 (2)
- I wondered about that. That's a different conversation. - Tre' 12:08:01 10/30/24 (1)
- beats me - PakProtector 02:30:34 11/02/24 (0)
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