I'm running a Sunn 1500s (vintage late 60's, not the new fender thing) through an Avatar 2x12. It has awesome tone, but isn't nearly loud enough. It can't even keep up with my friend's 50w marshall and 4x12, gets totally drowned out. Instead of throwing more $ at tube wattage, I figure my best bet is to get a second cab (probably an Avatar 4x10 to match) and just go with a big SS power amp. I have an Ampeg V2 that has a preamp out, which will probably give me a kickass bass sound a lot like an SVT, I just need some good clean, durable wattage to push it. So, what are the good deals out there on used SS power amps? I really don't need anything with a preamp, I'm happy to sort that out separately.