I bought a Peluso 2247 over 15 years ago, and although it sounded good overall, there was something about the high end that always bothered me, and it was a bit noisier than I’d prefer. A couple of years later I replaced the off-brand 6072 in it with an NOS GE black plate from Brent Jessee, to make a final decision if I was going to keep it or sell it, and it transformed it into one of my favorite sounding mics, and lowered the noise floor considerably. I’ve used them in a couple of other things since, and the difference isn’t b.s. Beautiful sounding tubes indeed!