Matched Pair RCA 6CG7 6FQ7 Vacuum Tubes With Shields NOS-Testing Type 27 By Brand There is also a shield

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

Bottom: smooth

7 milliamps and transconductance was 1510 micromhos for Tube One

1 12SK7GT/G

Two end links are available

Matched Pair RCA 6CG7 6FQ7 Vacuum Tubes With Shields NOS-Testing Type 27 By Brand There is also a shieldThis 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