This results in much more power being dissipated in the power tubes. If the bias voltage is too small, the idle current will be large. This results in some unpleasant-sounding nonlinearities in the output, but the tubes will run cool and last forever. If the bias voltage is too large, the idle current will be small. However, can this have hurt my tubes?When you adjust the bias on a tube amp, you're adjusting the idle current through the power tubes. You can learn to do this yourself, the peace of mind it affords is well worth the purchase price of a good digital multimeter.the only tool required to check the bias on your tube amplifier. I always check bias, even with "matched pairs" offered by Groove Tubes & others.just to be sure. In theory, if you replaced your tubes with identical branded & numbered tubes, you shouldn't need to re-bias your amplifier.in theory! If you don't have access to one, then just listen to the amp, if it still sounds ok, then it probably is. If you have access to a tube matcher, check to see if they are still a good match.if so go on & play it. A good match is important for a push pull amplifier. If they aren't too discolored they could still be ok but might have drifted apart in performance & may no longer be a good match. If the printing on the tube has changed color, say from white to burnt orange or brown they could be damaged & therefore not be suitable to be put back into service. If they still sound good they are probably ok, but you might have taken a little life out of them. Yes it could have, depending on how hard & how long they were played & how hot or cold they were biased.
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