6N1P-EV + 6P1P-EV (2 Matched Pairs) set for upgrade LISTON 12 NOBSOUND MS Amps

Liston 12, Nobsound MS-10D / 30D, Madison MAD-TA10BT, Rockville BluTube. MATCHED PAIRS - tubes has identical electrical characteristics. TUBES SET FOR UPGRADE AMPLIFIERS. Lot of 2 pcs 6P1P-EV +2pcs 6N1P-EV tubes.

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