Description

set of 4 vintage ge usa 12au7 ecc82 audio / preamp vacuum tubes, pristine spec, legendary sound reproduction short plate warm grey mica production, carefully curated set and twice tested full amplificaton test 116/122~110/120~116/118~110/115 % mutual gm (65 % good) + life test pass our unique gm output test applies 225 vdc simulating actual circuits w/ filtered dc + leak short gas check all open box tubes undergo a complimentary proprietary refurb process! value added seller qc give 100+ hours at your specific amps voltage to fully cure due to long term hibernation ships fast well packed worldwide, combined postage available ~authentic vintage hifidelity audio curation by caliacoustics~