I found out today that if I run the preamp (send) of my solid state amp to my tube amp's return, it sounds pretty good. I can EQ it like I want, and then get that tube overdrive, which sounds good. I also discovered that if I do the opposite & run my tube amp's send to the return of the solid state amp, that also sounds pretty good. I only did this for short bursts, and not very loud, because I was concerned about the difference in wattage & keeping the tube amp in standby too long. The send from the tube amp can operate with the amp in standby, but I have read it's bad to leave a tube amp in standby for long periods. I was also careful to turn on the power soaker in the tube amp. It's got settings for 18 watts, 5 watts, and off, so you can run it w/o plugging in a speaker cable. If I crank it up from the SS preamp over to the much less wattage tube amp for power, can I foul it up by pumping too much power into it?