6AQ5A BEST NOS NIB QUIETEST RCA USA 6AQ5A BLACK-PLATES ABBINATO QUAD 4 TUBI

6AQ5A ("A" = LOW-NOISE VERSION). ALL ACTUAL PICTURES OF THESE RCA "BLACK-PLATE" RARE 6AQ5A MATCHED QUAD! NOS RCA U.S.A.QUAD. PERFECT MATCHED QUAD. (4) RARE MATCHED TUBES. FOUR MATCHED (4) TUBES! You will never find such TIGHTLY Balanced & Matched TRIODE tube QUAD with such Matching mA/V (Gm) anywhere again!

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