2 matched old stock 6ca7 el34 preamp audio tubes by matsu japan, same bg code
revered tone by audiophiles worldwide, often compared to mullard xf series sonically
the tube-era british supplied expertise + tooling via 'transfer of technology' resulted in several critical audiophile advantages:
...same anodes, micas, electrode geometry, glass envelope, spot welding, grid wire spacing and cathode processing chemistry!
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take your listening experience to a higher level of 3-dimensional engagement w/ immersive holographic imaging
these vintage types are also coveted for their warm live-concert style delineation of instruments vocals and percussion
tune and transform your sound reproduction across multiple genres w/ more realism and delicate intimacy
carefully curated from japan direct, and twice tested, plus free postage!
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we also pride ourselves on a proprietary complimentary value-added complete refurb screening deox process
also see our new official site! true-nos sealed-box rarities, and reserve/request options, new updated part number list below
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full gm conductance test 99/99 % gm (65) + important 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 test + leak/short check
mutual gm conductance scores are the ability to transfer current ~ especially important for push-pull preamps
also supplier double checked for conductance via supplier tv7 / hickok 539c for unparalleled accuracy
give 100+ session hours w/ your specific amps voltage to fully settle in (break-in is important)
ships well packed worldwide w/ plain or branded 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 6au6a 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