3 vintage nec nippon japan
12at7 ecc81
audio preamp tubes
legendary neutral tone, high res dgetter sound stage revered by audiophiles!
direct japan import carefully curated from old collections
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full conductance test
100/100~105/101~102/105
% mutual gm
(65 % good)
our unique mutual gm output test applies 225 vdc simulating actual circuits plus filtered dc
also supplier tested via tv7 for conductance
+ life leak short gas checked
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all open box tubes undergo a complimentary proprietary one of a kind master refurb deox process!
give 100+ hours at your specific amps voltage to fully cure and settle in
ships fast well packed worldwide, combined post available
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~authentic vintage hifidelity audio curation by caliacoustics~