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I checked the biasing on my power amplifier two nights ago using compubias. The amp has 4 EL34's and are recommended to be biased at 12W -18W which is 50%-70%.
Left tubes where at 13w and 14w and the right tubes 12w and 13.5w.
I decided to adjust them to 14.7w per tube which I managed to do. I noticed an improvement.
Last night I checked the bias again and whilst the left tubes seem to be quite steady at 14.5w the right tubes are reading at 13w and 13.5w.
Can anyone help me by explaining why the reading is now different. Should I try re-biasing the right tubes again? Why are there fluctuations?
Thx so much, Bob
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Topic - Biasing power amp - compubias - Heifetz 23:18:08 06/26/17 (4)
- RE: Biasing power amp - compubias - airtime 07:31:30 06/27/17 (0)
- EL34 biasing - FenderLover 23:49:31 06/26/17 (2)
- RE: EL34 biasing - Heifetz 00:32:53 06/27/17 (1)
- If the tube exhibiting weaker signal than the others... - kootenay 00:48:42 06/27/17 (0)