legendary triple-mica toshiba 6189 preamp audio tube, very old production / rare premium top echelon 12au7 ecc82
revered audiophile tone offers the lowest noise and highest detail + quality, great 5814 alternative upgrade, 12au7wa
direct japan import carefully curated screened auditioned and twice tested!
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full amplification and balance test over 101/99~100/95 % mutual gm (65 % good) + useful life and leak short gas check
our unique mutual gm output test applies 225 vdc simulating actual circuits plus filtered dc
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all tubes undergo an added-value proprietary complimentary refurb process, one of a kind seller qc!
nos w/ no mica flashing = give 100+ session hours at your specific amps voltage to fully cure
ships fast well packed worldwide, combined postage is available
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~authentic vintage hifidelity audio curation by caliacoustics~