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In Reply to: 12au7 and 12ax7 suggestions posted by jaydacus on March 21, 2016 at 05:21:52:
Many years ago, I went a little crazy comparing 12AU7s/ECC82s. In the end, the best sounding were Amperex BugleBoys that I knew were authentic, because I bought them in the late 60s/early 70s, when fakes were not yet a la mode. However, the best 12AU7 is no 12AU7, IMO. I far prefer 12FQ7, which is a pop-in replacement, and NOS ones are MUCH cheaper than NOS 12AU7s. This is if you have a 12V filament supply. If you have a 6V supply, you can use 6FQ7, 6CG7, and/or a few others, all of which kick butt of any 12AU7 (again, IMO). However, if you do use any of the latter, please check the pin-outs; you may have to do some minor re-wiring of the socket to get the filament voltage where it needs to be.
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