old stock ten kobe japan 6v6 gt preamp audio tubes, rare early fujitsu
full good used amplificaton test 112 % mutual gm (65-130 % good) + useful life check didnt move the meter!
our unique mutual gm output test applies 225 vdc simulating actual circuits w/ filtered dc + leak short gas check
give 100+ session hours w/ your specific amps voltage to fully cure (break-in is important)
ships fast worldwide well packed + combined postage available
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~authentic vintage hifidelity audio curation by caliacoustics~