Matched Quad Sylvania 7A7 Vacuum Tubes Valves NOS-Testing Lot Of Four 6AL7GT Octal T08 but I could find no

but I could find no settings to test it

terrific flashing and GJ MVWV date codes

These four US-made 6SF7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

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 but I could find noThis 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.