Matched Pair RCA Cunningham Radiotron Number Type 30 #30 Vacuum Tubes Engraved Base Shoulder ST Shape NOS-Testing 12F5GT Grid Cap T51 They are slightly microphonic

They are slightly microphonic

WE HAVE HAD FEWER THAN A DOZEN LESS-THAN-FOUR-STAR REVIEWS OR HAVE LOST A CUSTOMER BECAUSE I REFUSED TO EITHER ISSUE A REFUND FOR A TUBE THAT WENT BAD AFTER IT HAD BEEN USED OR A BUYER KNEW NOTHING ABOUT TUBE REBRANDING AND CLAIMED THAT SOMETHING MADE BY TUNG-SOL AND BRANDED BY EMERSON WAS MADE BY EMERSON

new in box CBS-Hytron 12BZ7 tube tested to spec on our TV7/U

not included) in my AC-heated Alan Eaton single-ended 45 amplifier and they sound OK

they were forwarded to West Germany

Matched Pair RCA Cunningham Radiotron Number Type 30 #30 Vacuum Tubes Engraved Base Shoulder ST Shape NOS-Testing 12F5GT Grid Cap T51 They are slightly microphonicThis new old stock TESTING matched pair of engraved base RCA Cunningham Radiotron number type 30 tubes tested 34 and 36, respectively, on our Paul Hart calibrated TV7 U where minimum is 23 and 100% is 35. 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 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST FORMS OF