Matched Pair Sylvania Black Plate 12BY7 12BY7A Vacuum Tubes Valves T16 This lot of four North

This lot of four North American-made number 78 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

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new in box International Servicemaster 6CG8A tube tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 116%/104% where minimum (65%) is 70%/70%

Matched Pair Sylvania Black Plate 12BY7 12BY7A Vacuum Tubes Valves T16 This lot of four NorthThis matched pair of Sylvania black plate 12BY7 12BY7A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 54 while Tube Two also measured 54. (Minimum (65%) is 46 and 100% is 71. These tubes have black plates; chamfered O getters and rectangular radiators for cooler operation and longer tube life. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY