I have 9 Electro Harmonix 12au7 gold pin tubes, purchased maybe 4-5 years ago.
Never got around to using them in my VAC tube mono's, so, they been sitting in my
RCA tube caddy for past few years.
I have tested them in my rebuild/calibrated Hickok 6000A tube tester, and they all test excellent, and they
test within 10% on the triodes.
Regarding sonics, not too sure, typically EH I suppose.
Purchase with confidence from a long time Audiogon member [JUN-1999] with excellent feedback, no worries.
These tubes currently run anywhere from $19-$25 each. You can have these for $100 shipped inlcuding all fees, firm. No offers will be considered. Nice rugged tubes at a nice price.