Matched Trio RCA 6FQ7 / 6CG7 Vacuum Tubes NOS-Testing 6265 NOS NIB The GM-LABELED ones all have

The GM-LABELED ones all have 312 Sylvania EIA codes

This LP has light surface noise audible in quiet passages

This new old stock-testing lot of six Tung-Sol black glass 6K6GT tubes were tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of --36 volts for shorts

They measured 34

This nearly-perfectly-matched pair of GE 6SJ7s was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Trio RCA 6FQ7 / 6CG7 Vacuum Tubes NOS-Testing 6265 NOS NIB The GM-LABELED ones all haveThis new old stock testing matched trio of RCA 6FQ7 6CG7 dual triodes was tested on our TV7 U for shorts, gas and transconductance. There were no shorts or gas and their readings are as follows: Tube One measured 74 76 while Tube Two measured 76 76. Tube Three measured 76 76 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have steel support rods; ladder plates; side D getters and excellent flashing. As I write, I am playing them with