Matched Pair RCA-Cunningham 6K7 Vacuum Tubes Engraved Bottles NOS-Testing Type Sextal T06 64 and 65 where minimum

64 and 65 where minimum (65%) is 40

new in box milspec RCA 3Q4 / JAN3Q4 tube tested to spec on our Paul Hart-calibrated TV7/U

They are dead quiet when the CD player is muted and have excellent frequency response

new in box RCA 17CU5 / 17C5 tubes tested to spec on our Paul Hart-calibrated TV7/U

There are two new old stock

Matched Pair RCA-Cunningham 6K7 Vacuum Tubes Engraved Bottles NOS-Testing Type Sextal T06 64 and 65 where minimumThis new old stock testing, perfectly matched pair of RCA Cunningham 6K7 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Both measured 54 were minimum (65%) is 36 and 100% is 55. These tubes have engraved bottles. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931