I doubt the plate voltage changes. That switch most likely changes the voltage to the power tube grid. Much easier -- and much safer -- to do it that way.
Primaluna 300 integrated running 6L6 with high bias switch
I have a Primaluna EVO 300 integrated. I prefer the sound of 6L6 with the high bias setting. The low end is more firm and lively.
Primaluna says plate voltages run at 417v, I’m assuming that’s the low bias setting. Anyone know how much the high bias switch increases the plate voltage? Supposed to use the high bias setting for 6550, KT88, KT120.
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