Hi, my peavey xxx ii(2) requires 4 12ax7-a tubes as labeled on the amp. But the specs online reads to have 12ax7. Does have to be specifically 12ax7-a? Or does it not matter at all
No difference. 12AX7 is a 12AX7.
I'm just a kickin' and a gougin' in the mud and the blood and the beer.
Quote by dementiacaptain
No difference. 12AX7 is a 12AX7.

Unless it's an ECC83. In which case it's still a 12AX7
a 12ax7 goes by quite a few names, some versions are identical some are slightly different (like lower noise versions).

i have seen 12ax7 go by

even tubes like 12at7, 12ay7 and 5751 are a slightly lower gain tubes that are (in most all situations) perfectly acceptable replacements for 12ax7.
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