I'm curious to hear from anyone who has gone down the NOS rabbit hole and came out the other end more satisfied with their sound or not, particularly for non high-gain tones of clean, edge of breakup, to mid gain from classic Marshall amps. NOS stuff is crazy expensive these days, and I have read lots of reports of both good and bad experiences, ranging from points of view that it makes all the difference over new production stuff to paying too much for old junk. Opinions on where NOS tubes really matter also seems to cover the spectrum, i.e, some people say that the big difference is in V1, or every position. Some say that rectifiers don't matter in sound, only in reliability, where others say otherwise. Same goes for power tubes. Then there are reasons why NOS might matter. Clarity, dimension, noise, breakup character, reliability. What has your personal experience been?