Matched Pair Raytheon 6V6 6V6GT Vacuum Tubes Gray Glass NOS-Testing

Matched Pair Raytheon 6V6 6V6GT Vacuum Tubes Gray Glass NOS-TestingThis 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

Tube One measured 82/82 and Tube Two measured 85/84 where minimum (65%) is 50/50

This matched trio of GE 12HG7 tubes was tested on our Paul Hart-calibrated TV7/U (on the 12BY7 setting) for shorts

(New US-made 7408s typically test with plate current from the mid-teens to mid-30s with transconductance from 2300 micromhos or so

This General Electric 22JF6 tube tested 75 on our Paul Hart-calibrated TV7/U where minimum is 54 and new is 100

where minimum (65%) is 50/50 and 100% is 77/77

new in box US-made 6BC5 tubes tested to spec on our Paul Hart-calibrated TV7/U

It measured 48/54 where minimum (65%) is 40/40 and 100% is 62/62

Most don't test great

This matched pair of General Electric 6AU6A tubes was tested on our Hickok 800 for shorts

sutured tops

Tube Four (diodes): 55/62

This matched pair of milspec GE 0C3 / GL-0C3 regulator tubes were tested on our Paul Hart-calibrated TV7/U