Tung-Sol 6F6 6F6G Vacuum Tube ST Shoulder Shape NOS-Testing 7B4 NOS NIB perfectly-matched pair of RCA 6K7

perfectly-matched pair of RCA 6K7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

These tubes have engraved bottles

This lot of five US-made black plate

This lot of eight new old stock

They measured 93/80 for Tube One and 94/82 for Tube Two where minimum (65%) is 57/57

Tung-Sol 6F6 6F6G Vacuum Tube ST Shoulder Shape NOS-Testing 7B4 NOS NIB perfectly-matched pair of RCA 6K7This NOS testing Tung Sol 6F6G output tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 75 where minimum (65%) is 50 and 100% is 77. 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