Hoping for some help/opinions on how best to determine dissipation on a cathode bias amp. Working on a Harmony H415, 2x el84. I found a thread here that gave an easy to complete method, but then compared readings to other methods and came out with different results. Shooting for 100% dissipation at idle. Method 1 was: a. measure voltage from pin 3 el84 to ground...10v b. divide pin 3 voltage by the cathode resistor value...10/129 ohms = .0775ma c. measure plate voltage pin 7 to ground = 333v - cathode voltage of 10v = 323v d. 323v x .0775ma = 25.03W e. 25.03w/2 = 12.59w per tube...on a 12w max dissipation tube. Method 2 was Rob Robinette's website based calculator that used: a. Plate voltage pin 7 to ground = 333v, cathode voltage to ground = 10v a. plate to cathode v = 323 b. plate current (which I assumed meant pin 7 el84 to pin 8 5Y3) = .033ma c. .033ma entered into his calculator = dissipation of 10.8w or 89% So as you can see if I'm trying to get 100% dissipation at idle for cathode biased amp I've got 2 conflicting measurements ...am I doing something wrong?