I recently got a Crate RFX120. It's a pretty nice amp for the cash that i spent but i have a small gripe. I get quite a bit of hiss and hum whenever it's on. Even without using distortion it's there and it just gets worse when i use the amp's on-board reverb. Is there anything i can do to get rid of it? I though about getting a noise suppressor but that only quiets noise form the guitar not the amp itself. Could a guitar-tech improve my noise noise problem?
It could perhaps be a grounding problem. Or it could be a cable problem. Try swapping cables and see if you still have the problem. Try different outlets to make sure it's not the amp. Also, try different guitars too to make sure it's not that.

If you've come to the conclusion that it is the amp, perhaps you can return it still and get a new one.

How recently did you pick it up? If you got it from GC, they have a 30 day return policy that you should take into consideration.