Silver Supporting Member
Can bias change over time or do you really only need to bias when changing tubes?
The amp applies a bias-voltage to the tube to control the tube-current.Can bias change over time or do you really only need to bias when changing tubes?
I have a Victory V30 and it seemed to start sounding "fuzzy". I changed the power tubes but it didn't really change much so wondering if it needs biased. Or maybe it's the preamp tubes? It just doesn't seem to sound as good as it once did, but I also have noticed that my ears hear things differently over time so maybe my tastes are just changing? Hard to know.The bias voltage doesn’t normally drift, but things do change over time. As a tube ages, its conductance decreases slightly. That effectively increases the negative bias voltage, which itself didn’t change. The question is, how much time are we talking about?