I bought a Carvin 600 back in 1998 and mated it with an SR Goliath Jr as well as an Acme Low B2. The First head I recieved was a good sounding head, but suffered form static discharge that would show up as intermittent pops. That is unacceptable. So, I called Carvin and told them about the problem, and they issued an RMA and then sent me another head. This one sounded completely different. The preamplifier had a completely different tone, not as clear as the other unit, but the popping was gone. So I called again and asked why that should be. A Carvin technical service person indicated over the phone that Carvin is able to sell gear at that price point by having wider specifications for components, meaning components may vary in quality more greatly than is acceptable for other electronics manufacturers. So, the point: You are gambling a little bit with Carvin, and this would the differeing posts. Some poeple love Carvin, some people have sold all of their Carvin gear and will never buy again. I sent mine back, spent 5 years without an amp, and am now putting together an Eden/Stewart/Acme rig.
Brian