Assuming both amps have an FX loop, is it safe to send a preamp signal from a larger 100watt head into the poweramp of a 20 watt head? Is there anything I would need to be aware of? For this example, I'm wondering how my 6100 head would sound through either the sv20h or 2525h. I think it would be fine but figured I'd ask first before I try and fry something because of something I didn't think about. Actually sounding good is a whole other thing but I figured it would be safe technically. I know it would be the fx loop send of the preamp to the fx loop return of the power amp.