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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: RE: Sounds like to me you are using a 5K pot posted by DAK on October 18, 2016 at 13:35:21:
a 5K or 10K-pot will give you finer control, in the C- range needed to bias the tubes. Once, you get the set resistors closer to the ideal negative voltage. Play with the circuit-to-ground resistor's value (prolly going to be around 20-30k-ohm), until you get close to nominal C- voltage (prolly around minus 55-60VDC). Then, insert the 5k or 10k-pot.
Good luck!
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Follow Ups
- I agree with Chip - FenderLover 18:55:38 10/18/16 (5)
- RE: I checked my pot it is 50k - DAK 20:21:52 10/18/16 (4)
- RE: I checked my pot it is 50k - Chip647 05:06:40 10/19/16 (0)
- "I just built a SE kt90 amp." - FenderLover 21:41:03 10/18/16 (2)
- RE: "I just built a SE kt90 amp." - DAK 23:33:21 10/18/16 (1)
- "This arrangement yields between -30 to -45 volts of bias voltage." - FenderLover 07:25:42 10/19/16 (0)
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