Matched Trio Sylvania 7A7 Vacuum Tubes Valves Lot Of Three Hill Terry Gilkyson They have NU 188-5 and

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

new in box US-made 12K7GT tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One has some oxide flaking

new in box RCA 6BA11 tubes tested to spec on our Paul Hart-calibrated TV7/U

55 and 51 where minimum (65%) is 40

Matched Trio Sylvania 7A7 Vacuum Tubes Valves Lot Of Three Hill Terry Gilkyson They have NU 188-5 andThis 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