I've gotten all of my HV protection on my Swan Mark2 and was doing one last check of filament voltage I've measured 5.5v AC at the transformer and 5.3 AC at the tube pins. I've read about adding resistance to the output side of the transformer due to it being a multi output transformer. What size wattage resistor am I looking at to drop the .3 to .5 volts with the current on the 2 tubes? I'm going to do one more check at the pin base of the tube but I don't think it will be in the 5 to 5.25 A/C volts range. Quick edit, I did some calculations with info I pickup here and the data sheet. with 14.6 amps current and to drop .5 volts I'd need .0324 ohm at 6.533 watts or better. If someone could check that to make sure I'm correct, as I'm not. I havent had to figure this stuff for a long time and I'd hate to hurt the amp.