Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes NOS-Testing Plate Cap T27 These six RCA black plate

These six RCA black plate RCA 50B5 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box milspec (US Navy) Raytheon CRP-78 number / type 78 tube tested to spec on our Paul Hart-calibrated TV7/U

65/36 and 80/38

What makes this funny is that a major US defense contractor likely committed a number of felonies by smuggling communist Soviet tubes into the US at the height of the Cold War

new in box GE 38HE7 tube tested to spec on our Paul Hart-calibrated Hickok TV7/U

Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes NOS-Testing Plate Cap T27 These six RCA black plateThis new old stock testing, perfectly matched pair of GE 6SJ7s was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 77 for both tubes where minimum (65%) is 40. They have 56 26 188 4 and 61 26 188 4 date provenance codes, respectively. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES.