Heifetz Posted June 26, 2017 Posted June 26, 2017 Hello, 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. My question: 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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