Many years ago I A/B’d a highly regarded pair of Paoli M70 mono blocks against a B&K EX442 Sonata and was completely blown away with how identical in sound these two amps were and how utterly tubelike the B&K actually was.
The Paoli’s were a highly modified pair of Dyna MkIII’s using 8417 output tubes and the B&K a 200 wpc dual mono SS amp. B&K’s always had a solid reputation of sounding very tubelike and the EX442 didn’t disappoint. One could be had in the under $500 range. I think you’d be hard pressed to find something as reasonably priced and as tubelike.