Beat me to it. Try it! It doesn't even need to be cranked into overdrive. It has a nice tubey tone. I used it with my swr Goliath IIjr when I had a low volume rehearsal with electric drums. I was told to turn down, I couldn't even get loud enough to overdrive that day, but it still sounded cool. That cab was stolen. A few months ago I tried it with my rumble 112, which is now the only small cab I own. I think the swr was a tad more sensitive.
Someday I will mod mine, I plan on using a switch to do the " bright" mod which involves cutting out a resistor, but I want the ability to switch back and forth. Tone, gain (or master) and reverb are other things I would like to add. Probably the bitmo reverb, and maybe their other hotrod packages. Or just find an epiphone hot rod model.
I regret selling my old bugera v5, which was also a great low volume bass amp. I was making room and needed cash, and figured my vox vt40+ was more practical, and it is, to a point. Still not a class A tube amp... And my guitar cab ended up getting stolen so the valve Jr has sat mostly unused in the meantime.