Not a reference 75SE owner. If no problem biasing V1 and V2, my suggestion is swap V1 and V2 to V3 and V4, if the problem follow the tube, you have a bad tube, if bias adjustment cannot be done only on V3 position then it could be a bad potentiometer or bad tube socket connection...
ARC 75 SE Bias Issues
Hi - I’ve been a happy ARC 75SE owner for over 5-years. I just moved to a new house and in the process my beloved 75SE stop working, here is what is happening: when adjusting the bias for the tubes, tuve #3 bias adjustment will not respond, the gauge is al the way to the left and won’t move. Is this a tuve issue or something else? Any other ARC owners had have the same issue? Thanks!
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