I have new El34's going into a 74 50W. I know that to properly bias an amp, a couple steps must be taken. After discharging the Filter Caps I am lost. I have a multi meter and a calculator but do not know what to do after discharging the FC's. If biased too hot could I ruin the OT? How about too low? I don't mind a little crossover distortion, but I want the amp to sound good. With the last set of Winged C's the plate voltage was at 470. Would this be the same at my home (not the tech's) with different tubes?