Do you have a scope? I'd say the way to really confirm this is to try it with and with out the drain resistor. See if the wave is nicer one way or another. I would guess the difference will be negligible, but that's only a guess.AbeFM wrote:Do you still think I should drop the drain resistor?
You mention it's PWM, these resistors will also change the rise and fall times of the transistor. I suspect your PWM is low enough frequency that this won't matter much. If you can choose a PWM you may want to try lower frequencies if possible.