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Actually this is my first bass amp, but I've got a couple of valve guitar amps. A 20 watter with 2xEL84 is dead quiet with the same cab. I got the Ampeg just for playing at home, and potentially for recording. The acoustics in the space probably aren't that good, so maybe that accentuates the perceived hum, dunno. Still seems to me that for recording the SNR won't be great, but maybe I'll need to actually try it out.
New amp, I'm a sucker for a good deal... 20W valve Ampeg. I don't really know anything about bass amplification, but so far I like how this sounds. Even with the guitar cab -- I find the G12H-100 fairly neutral sounding, apparently they were even used for bass bitd. There's a bit more mains hum that I'd like, which might also be annoying for mic'ing, but on the other hand there's a handy post-output transformer DI out.