I've got an old Selmer Treble'n'Bass 50 MkI (croc skin). It's the one with a rectifier tube and an extra preamp tube in the bass channel. The extra preamp tube was dropped in the MkII and the rectifier was changed to solid state in the MkIII (although I understand there was some overlap between versions so there are MkIIs with the extra preamp tube and possibly also MkIIIs with the tube rectifier). I have no idea how the later versions compare (but judging from the guitar forums they grew progressively harsher by each version). Anyway, I got this amp about 10-12 years ago. Mainly as a guitar amp for my studio but it never got much use. Everybody just wants Marshalls/Fenders/etc. I also tried it for bass on one or two rehearsals with my band but it wasn't loud enough to cut through. I never really tried it as a bass STUDIO amp though... But recently I brought it home. I thought it might find some use for bass with my home recording setup. And if not I would just sell it. I've been testing it for a couple of weeks now and WOW! Talk about vintage tube tone! I don't know if it's the tube rectifier but this thing makes all my other tube amps feel almost solid state by comparison! Ok, maybe a slight exaggeration there but this thing just feels great! The lows are seriously deep, yet clear. I think the only other vintage tube amp I've tried with similarly deep/clear lows must be the DR201. At lower volumes it is crystal clear, INCREDIBLE detail but not in a cold/sterile way. When pushed it's got this spongy feel that I just love! Not muddy at all, just a bit syrupy and filthy (in a good way). Kinda like a better version of a Bassman 100: warmer sounding, not as scooped, a LOT nicer breakup, but definitely a bit of that vintage Fender vibe. Which may not come as a surprise when considering that the TnB was supposedly based on a Blonde Bassman (as opposed to the classic Marshalls that were based on the Tweed Bassman). But unlike the Blonde Bassman it's got EL34 output tubes. I just LOVE EL34s with bass, especially when they're pushed a bit! Has anyone else tried these amps with bass? I mean, they certainly won't be everybodys cup of tea, there's definitely some sag when it's pushed. For someone into ultra tight solid state/class D it would probably be their worst nightmare! And I also suspect that anyone using them "back in the day" HATED them (must have had a serious lack of power/clean headroom for live use, especially in the pre-PA era). But as a VERY vintage sounding STUDIO amp it's simply amazing for bass! This one is definitely going back to my studio! I should probably add that I've put some pretty sweet vintage tubes into it: Mullard+Heerlen ECC83 longplates from the late 50s for the gain stages and a 60s Tesla E83CC (frame grid) for the phase inverter. The EL34s are just TADs. Vintage tubes really make a HUGE difference in old amps like these. Those late 50s "Philips-family" longplates have some SERIOUS low extension compared to ANYTHING else I've tried! Anyway, I'd love to hear your experiences with these amps. I expect most of you probably hate them but I'd still love to hear about it. Especially how they were received back in the day. I expect they must have been considered a poor mans Fender/Marshall and not particularly popular? As far as I can tell the 100w version wasn't released until the MkIV era? So probably a bit late to compete with other brand's more powerful models?