Matched Pair National Union NU 6V6 6V6GT Black Glass Vacuum Tubes NOS-Testing Rudy Rosa 1976 KY factory around the time

KY factory around the time of the GE takeover of Ken-Rad

It has a rectangular

There is nothing I can say about this item except that I could not test it

new in box RCA 12AV6 tubes tested to spec on our Paul Hart-calibrated TV7/U

S5E and 913 date codes

Matched Pair National Union NU 6V6 6V6GT Black Glass Vacuum Tubes NOS-Testing Rudy Rosa 1976 KY factory around the timeThis new old stock testing matched pair of National Union 6V6GT blackout glass output tubes was tested on our Maxi Matcher 2 with 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 2670 micromhos for Tube One and 2430 for Tube Two. Plate current measured 27. 8 and 27. 9 milliamps, respectively. (New US made 6V6s typically test with plate current from the mid teens