Noise suppressors.....what a buzz kill.

Try another circuit?

 

I recommend to never put anything that (re)produces sound on the same circuit with a dimmer!! Same goes for motors (compressors, refrigerators, elevators, etc.)

 

This should be the first thing attempted.

@Axtman : Unfortunately I've often found that rooms with dimmers are incredibly noise-prone even when plugging into a different circuit. Try running the lights without any dimming to minimize the problem, but expect that you'll always have some noise. If you can't get around the noise, any old noise gate pedal will get the job done well enough for rehearsal purposes. Not ideal, but perhaps better than dealing with a noisy rehearsal.

 

either dime or kill the dimmer! that will get rid of the noise.

 

Play louder ???
Sorry... couldn't resist!

In all seriousness, the above recommendations are your best solution. Use a different circuit. Or turn off the lights.
If neither are NOT an option, as a last resort, you MIGHT try something like the Ebtech Hum eliminator, but I don't know if it will work.

 

Take along a lamp and leave the lights.

 

Replace the dimmer with a normal switch.

 

Replace the drummer with a normal switch.

 

Expensive option, but it'll work every time: a conditioning UPS. Cleanest source of power you can get, short of a standalone battery array, mostly because it _is_ a battery with a well-regulated charging system bolted onto it.
You might be able to get a standalone power-conditioner, but I've never seriously looked into those.

 

I wouldn't use a noise suppressor. I'm guessing you're getting 60hz hum with single coils. I would recommend getting humbuckers installed.

If you need a suppressor, the ISP Decimator is the best one in my books. I wouldn't recommend using an external fix for an internal issue though.