Matched Pair Ken-Rad 6N7 Vacuum Tubes Valves NOS-Testing Strauss Dance Of US Army Signal Corps SC278A

US Army Signal Corps SC278A contract codes and two additional support rods per tube for increased rigidity and lowered microphonics

new in box RCA 7C7s tested to spec on our Paul Hart-calibrated TV7/U

Top: smooth

These nine new old stock

there are a few scratches

Matched Pair Ken-Rad 6N7 Vacuum Tubes Valves NOS-Testing Strauss Dance Of US Army Signal Corps SC278AThis new old stock testing matched pair of Ken Rad 6N7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 57 63 while Tube Two measured 60 61 where minimum (65%) is 38 38 and 100% is 58 58. These are 6N7 tubes. They are not 6SN7s! Unfortunately I can't tell you how they sound as we do not have any equipment that uses them nor do we have adapters at this time.