Matched Pair Ken-Rad 6N7 Vacuum Tubes Valves NOS-Testing Strauss Dance Of This pressing has lightly-moderate surface

This pressing has lightly-moderate surface noise audible in quiet passages and barely-audible in voice-level passages

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

Top: smooth

new in box National Union 7A5 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Ken-Rad 6N7 Vacuum Tubes Valves NOS-Testing Strauss Dance Of This pressing has lightly-moderate surfaceThis 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.