"Bad Boys" have been expensive for a long time, so I get that. NOS Chrome Domes and GEs aren’t so expensive at all (yet) and sound great."
True. One can find lower cost tubes. As long as one buys from a reputable tube dealer with good test equipment, it helps. Some noisey tubes out there being sold as matched pair NOS too on auctions.
Have you seen what some "good" testing tubes look like on a curve tracer, looking for matched triodes within each tube? My tube sources pass and sell them off as non-matched, non-NOS, lower grade with that disclaimer regardless of brand. Others will say, if it works use it, okay, hope they don’t pay too much for them. Finding good ones that truly test as NOS and balanced triodes on each side of the tube is getting to be harder to find. Best of luck.