Originally Posted by
LowPhreak
I can recommend the Mesa Baron with WIMA caps upgrade (stereo, up to 225/w.p.c.) and Audio Research Classic 120 (monoblocks, 110/w.p.c.), since I've owned and used them with several different speaker types. Not sure how "vintage" they are considered to be, but both are out of production and won't be that easy to find, and are very good tube amps. The ARC's will not be cheap and the Baron will be less that those (single chassis, etc.) but IMO are worth the hunt.
I've used both on Martin-Logan e-stats, B&W Nautilus (ported), Magnepan Tympani IV and 2.6R panels, A/D/S L990 (sealed), KEF C80's (sealed), and others, so I'd imagine they'd work well with many JBL's too.