audiophile crown jewels, revered worldwide for their rich live-concert holographic sound stage imaging
set of 2 vintage grey plate dgetter first edition mullard mitcham 12at7 ecc81 audio / preamp vacuum tubes
pristine pair w/ authentic r0e4 / r9l5 etch codes and mullard boxes, old production
carefully curated screened and twice tested, plus complimentary proprietary refurb deox process
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full gm conductance test 101/111~115/100 % gm (65) + important life test pass! (life check = longetivity indicator)
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
also double checked (twice tested) for mutual gm conductance via supplier tv7 / hickok 539c
give 100+ session hours w/ your specific amps voltage to fully settle in (break-in is important)
ships well packed worldwide w/ boxes
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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