the legendary telefunken 12ax7 ecc83 smooth plate is an audiophile crown jewel! 
revered harmonic doubling layers vocals, chords and instruments w/ a thick holographic getter
legendary natural organic warm response w/ flat mid drop and transparent sound reproduction
authentic germany <> diamond base w/ very nice silkscreen and original box!
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we pride ourselves on a proprietary complimentary value-added complete refurb screen and deox process, plus free postage!
also check out our official site! new part numbers including true-nos sealed-box rarities, and reserve/request options
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full gm conductance test + important life test pass! (the life check is a key feature indicating longetivity)
our special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test and leak/short check
mutual gm conductance scores are the ability to transfer current ~ especially important for push-pull preamps
twice tested! all tubes are double checked for mutual gm conductance via tv7 / hickok 539c
give several sessions or up to 100+ hours w/ your specific amps voltage to settle in (break-in is important)
ships well packed worldwide
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authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics
including limited special editions + rare true-nos sealed box + pinched waist
also high-resolution headphones + premium vocal stage and studio mics
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6dj8 7dj8 6922 7308 / ecc88 pcc88 e88cc e188cc cca
12ax7 12at7 12au7 12bh7 / ecc83 ecc82 ecc81 e82cc
6bq5 6au6 6267 6ca7 6ca4 6aq5 / 6v6 6l6 6sl7 6sn7 5y3 5u4 5ar4
5814 5751 5965 6189 6201 7062 7189 / cv2492 cv4004 cv455 cv4085
el34 el84 ef86 ef94 ez81 ecc85 e180cc gz34