a collectible audiophile classic! the crown jewel of any setup worldwide
highest resolution preamp illuminator, transparent and expansive stage, incredibly lucid vocals
pinch waist philips amperex 6922 gold pin, rare grail regard mid-band euphony and 3d presence
authentic '59 usa *9 production w/ special edition beckman screened red label! premium audio grade
considered the most magical sound ever made w/ most precious metals of the tube era heyday
great tube mic upgrade or preamp stereo tuneup, elevate your sound and fidelity today
carefully curated screened and selected process, plus twice tested for unparalleled accuracy
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full amplification test balance 90/96 % mutual gm (65 % good) + useful life test pass! + leak short gas check
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
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we also pride ourselves on a proprietary complimentary value-added complete refurb screening deox process
give 100+ session hours w/ your specific amps voltage to fully settle in (break-in is important)
ships well packed worldwide + free postage!
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authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics
also see our new official site! true-nos sealed-box rarities, and reserve/request options
including limited special editions + rare true-nos sealed box + pinched waist
also high-resolution headphones + premium vocal stage and studio mics6dj8 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