National Union NU 807 JAN-CNU-807 Vacuum Tube Milspec 6V4 Rectifier They have steel plates

They have steel plates

Transconductance measured a perfectly-balanced 2700/2700 micromhos

Transconductance measured 2000/1900 micromhos for Tube One and 2000/2000 micromhos for Tube Two

This matched pair of RCA steel plate 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U tester for shorts

RCA-LABELED 16A8 / PCL82 tube -- and two others just like it --tested to spec on our Paul Hart-calibrated TV7/U

National Union NU 807 JAN-CNU-807 Vacuum Tube Milspec 6V4 Rectifier They have steel platesThis new old stock TESTING National Union 807 output tube was tested on our Maxi Matcher 2 for shorts, gas and transconductance with 400 volts on the plates and a bias of 48 volts. There were no shorts or gas. Plate current draw was 20 milliamps while transconductance measured 2450 micromhos. (New 807s typically test from the mid teens to mid 30s with transconductance from 2200 micromhos). I am playing it now in my Musical Paradise 301 MK 3 (with an