Matched Pair Sylvania Black Plate 12BY7 12BY7A Vacuum Tubes Valves T16 new in box GE 6HB7

new in box GE 6HB7 tubes tested to spec on our Paul Hart-calibrated TV7/U

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

IF YOUR COUNTRY IS SIMILAR

59 and 62 where minimum (65%) is 45

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

Matched Pair Sylvania Black Plate 12BY7 12BY7A Vacuum Tubes Valves T16 new in box GE 6HB7This 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