Would anyone be so kind as to help me calculate the required resistors to drop my heater voltage? I built a 5F1 Champ circuit and the heater voltage is 6.8v instead of 6.3v, and as I understand it this will shorten the life of my tubes. 6V6GT 2: 3.4v 3: 356.5v 4: 330v 7: 3.4v 8: 20.3v B+1 383v I'm using the Classic Tone 40-18019 PT. I took a crack at the calculations and I think I might need to use two 0.5 ohm resistors, but that could be wrong. I'm also not sure what wattage they should be rated for. Thanks!