Matched Pair Sylvania 6V6 6V6GT/G Vacuum Tubes Silver And Gray NOS-Testing CRC5Z4 It has a top double-O

It has a top double-O getter

If you want them both

This is a late-50s

where minimum (65%) is 25/25 and 100% is 38

The 1P21 is missing a pin

Matched Pair Sylvania 6V6 6V6GT/G Vacuum Tubes Silver And Gray NOS-Testing CRC5Z4 It has a top double-OThis new old stock testing matched pair of Sylvania silver and gray 6V6GT G output tubes was tested on our Maxi Matcher 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 20. 9 milliamps with a transconductance of 2390 micromhos while Tube Two measured 21. 6 2590. (New US made 6V6s typically test with plate current from the mid teens to mid 30s with transconductance from 2300