12-17-2017, 09:11 PM
I typically install the biggest resistor that I can fit in the space. Not quite sure where I picked up this practice, but I'm pretty sure I have never put a 1/4-watt resistor in a tube amp. A higher rated resistor is going to last longer and be less noisy. On the other hand, a metal film resistor will last just about forever and produce less noise, so it is less of an issue. But people with better ears than mine seem to think that carbon-based resistors sound better. In any event, you really should give some thought to what wattage is actually required. You don't want to skimp on resistors where there is significant current flowing, such as a cathode or plate resistor.