Matched Pair Sylvania 12B4 12B4A Vacuum Tubes Valves NOS-Testing Stereo DL 75256 gray ladder-plates

gray ladder-plates

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They measured 29 and 31 where minimum (65%) is 22 and 100% is 40

perfectly-matched pair of Sylvania 6SJ7s was tested on our Paul Hart-calibrated TV7/U for shorts

Plate current measured 15

Matched Pair Sylvania 12B4 12B4A Vacuum Tubes Valves NOS-Testing Stereo DL 75256 gray ladder-platesThis 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