Matched Quad Sylvania 7A7 Vacuum Tubes Valves NOS-Testing Lot Of Four 6AL7GT Octal T08 new in box milspec RCA

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

An 8 out of ten

This beautiful new old stock-testing Sylvania-MANUFACTURED

but I could find no settings to test it

One is a 1P21 while the other could not be identified

Matched Quad Sylvania 7A7 Vacuum Tubes Valves NOS-Testing Lot Of Four 6AL7GT Octal T08 new in box milspec RCAThis new old stock testing matched quad of Sylvania 7A7 tubes was tested on our Hickok 800 and all measured 1900 micromhos where new nominal is 2000 and minimum (65%) is 1300. 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 OF THE TUBES WE SELL ARE OVER 70 YEARS OLD.