Matched Trio Sylvania 7A7 Vacuum Tubes Valves Lot Of Three Hill Terry Gilkyson mesh plate tubes tested 42

mesh plate tubes tested 42 and 50 on our Paul Hart-calibrated TV7/U where minimum (65%) is 25 and 100% is 38

Two are National Union and there are one each of GE and RCA

55 and 51 where minimum (65%) is 40

Tube One has some oxide flaking

They have NU 188-5 and 3-09 188-5 date/provenance codes

Matched Trio Sylvania 7A7 Vacuum Tubes Valves Lot Of Three Hill Terry Gilkyson mesh plate tubes tested 42This new old stock testing, perfectly matched trio of Sylvania 7A7 tubes was tested on our Hickok 800 for shorts, gas and transconductance. There were no shorts or gas. All measured 1950 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