Matched Pair Sylvania 12B4 12B4A Vacuum Tubes Valves NOS-Testing 9003 Milspec new in box Cunningham 14F7

new in box Cunningham 14F7 tube tested to spec on our Paul Hart-calibrated TV7/U

The remaining two are labeled "1X2B

PLEASE INSURE THEM

MOST OF THE TUBES WE SELL ARE OVER 70 YEARS OLD

Matched Pair Sylvania 12B4 12B4A Vacuum Tubes Valves NOS-Testing 9003 Milspec new in box Cunningham 14F7This new old stock testing, perfectly matched pair of Sylvania 12B4A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 46 while Tube Two measured 46 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 ALSO