I believe on a 5AR4 the capacitor directly following it shouldn't be higher than 60uf. My amp is setup with rect-standby switch-40u-20u (power tube B+) then two RC filters for B+'s. I'm getting hum with the PI tube out, I need to AC bypass the grids to see if I'm picking up hum there. But when I turn the amp on standby the hum goes immediately (so I think PS). So if the hum is through the power tube B+ can I add any more filtering for the first node?
thanks
thanks
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