National Union NU 807 JAN-CNU-807 Vacuum Tube Milspec 6V4 Rectifier I am playing them as

I am playing them as I write with Mino Cinelu's eponymous album in my Mini Mite 2013 and they sound great

They have steel plates

Tube One (Unitron 5654-LABELED

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

This nicely-matched pair of General Electric 12AU7/ECC82 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

National Union NU 807 JAN-CNU-807 Vacuum Tube Milspec 6V4 Rectifier I am playing them asThis 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