Matched Pair RCA 6CG7 6FQ7 Vacuum Tubes With Shields NOS-Testing Type 27 By Brand This new old stock-testing lot

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

7 milliamps and transconductance was 1510 micromhos for Tube One

It is probably a Mullard

There is also a shield between the triodes for reduced cross talk

Matched Pair RCA 6CG7 6FQ7 Vacuum Tubes With Shields NOS-Testing Type 27 By Brand This new old stock-testing lotThis new old stock testing matched pair of RCA 6CG7 6FQ7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 73 74 while Tube Two measured 78 75 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have steel support rods and top, harp shaped getters and anode radiators for cooler operation and longer tube life. There is also a shield between the triodes