pair of old stock same code e99f / 6bj6 telefunken branded audio tubes made by heerlen philips
both w/ same⊿ 4I5 etch and 11058 batch code, 1964 holland production, includes oe telefunken boxes
the e99f / 6bj6 is a mini pentode w/ low grid capacitance, high gm and low heater current, apps like u73b
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full conductance test 95 ~ 94 % mutual gm (65%)+ life test pass! (life check = key longetivity indicator)
our special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas and leak/short check
mutual gm scores = current transfer ability, especially important for push pull amps
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we also pride ourselves on a proprietary complimentary value-added refurb screen + deox process
give 100+ session hours w/ your specific amps voltage (break-in is important)
ships fast well packed worldwide + free postage!
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authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics
see our official site! reserve/request options and part number list below
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 e80cf gz34 (ef804 soon)