Alternitively if your current is too low and you are operating at say something like 50% plate dissipation, your tone may suffer.
This is higher than the 70%, and will shorten tube life. In this scenario, 10.75W is 89% of the max plate dissipation of the 6v6 (10.75/12=0.89). So an example of numbers you might get are a plate voltage of 430V, current of 25mA. For most 6v6s, 100% dissipation is 12watts. Ideally to optimize tone and life of your tubes, it is common practice to set your bias such that you operate at 70% of mass plate dissipation. Plate dissipation (watts) = Plate Voltage x Plate Current (in amps) Once you have these measurements you can calculate plate dissipation: The alternative is measuring with a multimeter but this is a little more involved and given the fact that you are new to biasing I'd probably recommend going the bias probe route. I have had good experience with Eurotubes's Bias Probe since it will show you both those measures simultaneously. You can get these from Weber, Bias King, Compu Bias, etc. The easiest/safest way to measure both of these is with a bias probe. The pot is located on the underside of your chassis near the power transformer. Your bias pot on your PRRI will allow you to adjust the plate current (more on this later). To bias your amp, you'll need to know a few key measurements: I posted this reply in your other thread but will include it here:
You've invested this much into your vintage amps, you might as well invest a bit of time into learning how to optimize their tone and function. I think understanding and being able to set your amp's bias is critical.
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