Matched PAIR SYLVANIA 12AX7A ECC83 AUDIO VACUUM TUBES TESTED D.10130.C

PAIR SYLVANIA 12AX7A REPRODUCTION BOXES INCLUDED MADE IN THE USA VINTAGE STOCK GREY PLATES HALO GETTER MINIATURE TUBES TESTED ON HICKOK TV7 RESULTS= 45/43 AND 44/43 MINIMUM= 32/32

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