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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.
I've got the 50w version - they're pretty decent amps. Mine hums too but not noticeably when you're playing, it's quieter than the fan noise on a class d. I think it's might just be from being used the solid state amps that are absolutely silent?