2 NOS Pristine Matched Matsu/Mullard 12AT7 ECC81 Vintage Hifi PreampAudioTubes

2 NOS Pristine Matched Matsu/Mullard 12AT7 ECC81 Vintage Hifi PreampAudioTubes
2 NOS Pristine Matched Matsu/Mullard 12AT7 ECC81 Vintage Hifi PreampAudioTubes
2 NOS Pristine Matched Matsu/Mullard 12AT7 ECC81 Vintage Hifi PreampAudioTubes
2 NOS Pristine Matched Matsu/Mullard 12AT7 ECC81 Vintage Hifi PreampAudioTubes

2 NOS Pristine Matched Matsu/Mullard 12AT7 ECC81 Vintage Hifi PreampAudioTubes

2 matched old stock matsu japan hard vacuum 12at7 ecc81 preamp audio tubes, pristine pair / medical editions. Legendary tone regard w/ mullard'transfer of technology, unique angle halo getters similar to rare valvos.

Vintage'60s production w/ the most precious metallurgy of the tube-era = more accurate sound reproduction + warmth. Full amplification balance test 130/130 130/130 % mutual gm (65 % good). + our life leak short gas check.

Our unique mutual gm output test applies 225 vdc simulating actual circuits plus filtered dc. Also supplier tested via tv7 for conductance, while your results will vary... Circuit test = best test. Nos w/ no mica flashing = give 100+ session hours at your specific amps voltage to fully cure. Authentic vintage hifidelity audio curation by caliacoustics.
2 NOS Pristine Matched Matsu/Mullard 12AT7 ECC81 Vintage Hifi PreampAudioTubes