J
joafink2
Active member
I have a Bogner Ecstasy Classic that's been sounding under the weather. Almost sounds fuzzy. Decided to check the power tubes and they are drawing 3.5mA. Were previously biased at 25mA a few months ago. I put in a new set of power tubes to check and those measured at 1.5mA. What could cause the sudden drop in bias? I mean, I can't imagine the bias drifted that much on its own so my guess is there is an issue. Should I try to just rebias at a higher mA or is there definitely an issue here?