Lansdale 12AV7 Vacuum Tube NOS NIB Black Plate For Your Univalve 12FM6 Septal This GE 18A5 tube tested

This GE 18A5 tube tested to spec on our Paul Hart-calibrated TV7/U

Two end links are available

Transconductance measured 82 for Tube One (6AU6A) and 84 (6AU6) for Tube Two where minimum (65%) is 58

There is a hairline crack in the base of Tube Two

Lansdale 12AV7 Vacuum Tube NOS NIB Black Plate For Your Univalve 12FM6 Septal This GE 18A5 tube testedThis new old stock, new in box Lansdale MANUFACTURED, GE LABELED 12AV7 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 38 39 where minimum (65%) is 21 21. This tube has black plates; a D getter; terrific flashing and L2E date codes. Lansdale was the manufacturing arm of Philco and sold tubes to other companies not only during the transition from tubes