I got a Marshall valvestate for 100 dollars with a 4x10" cab, but I really don't like the head. I was looking for a power amp to use so I could just use the preamp of the Marshall and saw the Mesa 20/20. Would it sound like a full tube amp if I ran the slave out back into the effects return for more power when needed or would it just sound a little different. If not I'd rather get a bigger power amp. anyone