Matched Trio Sylvania 12B4 12B4A Vacuum Tubes NOS NIB 6GV5 NOS NIB where minimum (65%) is 25/25

where minimum (65%) is 25/25 and 100% is 38

This new old stock-TESTING matched pair of Sylvania 6F6GT tubes was tested on our Maxi-Matcher -- with 325 volts on the plates and a bias of -36 volts -- for shorts

These tubes have crenelated rectangular mica spacers

It has a sheet getter

Matched Trio Sylvania 12B4 12B4A Vacuum Tubes NOS NIB 6GV5 NOS NIB where minimum (65%) is 25/25This new old stock, new in box matched trio of Sylvania MANUFACTURED, Emerson BRANDED 12B4A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 44, 44 and 48 where minimum (65%) is 32 and 100% is 49. Wish I could tell you how they sound, but I don't have any equipment that uses these. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE