Matched Pair Raytheon 6V6 6V6GT Vacuum Tubes Gray Glass NOS-Testing February 03 2025 This new old stock-testing matched

This new old stock-testing matched quad of Sylvania 7A7 tubes was tested on our Hickok 800 and all measured 1900 micromhos where new/nominal is 2000 and minimum (65%) is 1300

new in box RCA 12BZ7 tube tested to spec on our TV7/U

"Britain" is printed on the tube itself and there appears to be an incomplete Amperex-style code near the base

It measured a perfectly-balanced 75/75 where minimum (65%) is 50/50

new in box US-Made 21GY5 tubes tested to spec on our on our Jackson 648

Matched Pair Raytheon 6V6 6V6GT Vacuum Tubes Gray Glass NOS-Testing February 03 2025 This new old stock-testing matchedThis new old stock TESTING matched pair of Raytheon gray glass 6V6GT output tubes was tested on our Maxi Matcher 2 at real operating voltages of 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 27. 4 milliamps 2500 micromhos for Tube One and 27. 5 2210 for Tube Two. (New US made 6V6s typically test with plate current from the mid teens to mid 30s with