Bump. Anyone at all ever even heard of the Ampeg SB 12? It's one of the portaflex "fliptop" amps. Probably the least-known one of them all. Hate to say it, but I once had a real 1969 B-15N, like Jamerson used...and I sold it. Wish I had 'er back. But I digress.
One thing I'm wondering about my SB 12 is whether to use it for guitar or bass, since it was designed to be used for either. I think I'm kind of leaning toward guitar since the output power would make it nice for overcranking a guitar through.