Matched Pair General Electric GE 12BH7 12BH7A Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing June 06 2026 These four milspec Sylvania 5Z4

These four milspec Sylvania 5Z4 rectifier tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box Cunningham 14F7 tube tested to spec on our Paul Hart-calibrated TV7/U

They tested as follows: 56 and 58 where minimum (65%) is 395 and 100% is 60

These nine tubes were tested on our Paul Hart-calibrated TV7 for shorts

Tube One measured 1930 micromhos

Matched Pair General Electric GE 12BH7 12BH7A Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing June 06 2026 These four milspec Sylvania 5Z4This new old stock testing matched pair of GE 12BH7A 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 56 59 while Tube Two measured 58 59 where minimum (65%) is 30 30. These tubes have gray plates; copper support rods; excellent flashing and top O getters. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT