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In Reply to: RE: Fixed bias problem, and no, it is not the tubes. posted by DAK on January 11, 2017 at 18:00:49
What value are the grid resistors? If they are too high that can cause problems. For the KT-120 with fixed bias the max is 51K - so if you have higher than that it could be the problem.
Follow Ups:
Hi Jim, they are 50K and the adjusting pot is also 50k. thanks for replying
So the "leak" path is 50K plus some portion of the pot element resistance. That should be okay but if you can't find anything else causing the problemkeep in mind the total grid circuit resistance is still about 75K or so.
Best of luck with your detective work!
And that amp works fine with the same tubes. All the resistors are 1 watt except the grid which is 1/2watt carbon comp.
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