hi folks, I recently scratch built a 5F1, using the StewMac layout, and while running the numbers on the tube bias calculator, found that maybe it could use a little hotter bias. I used the 275V windings on a Hammond 290AX, and all the voltages are very close to the vintage 5F1 spec. B+1 is 335 vs. target of 340, B+2 is 286 (vs. 295 target), and B+3 is 245 (vs. 250 target). Per attached, however the plate dissipation is 10.4 watts, and 74.3%. Does it make sense to drop the cathode resistor from its current value of 467R to something in the 345R range to drive dissipation up to 100%? Amp works fine, but thinking it could be "finer" if it was biassed a little hotter. ie. don't know what you're missing until you hear it sort-of-thing. Can't find any threads about a cold bias on a Champ, always seem to be too hot! Thanks for the help!