Matched Pair RCA 6CG7 6FQ7 Vacuum Tubes With Shields NOS-Testing Type 27 By Brand GM-Delco-BRANDED 6AX8 tubes tested to

GM-Delco-BRANDED 6AX8 tubes tested to spec on our Paul Hart-calibrated TV7/U

7 milliamps and transconductance was 1510 micromhos for Tube One

new in box Raytheon 1032 / CK1032 is one of the strangest tubes I've ever seen and I have no idea how to test it

Bottom: smooth

It is probably a Mullard

Matched Pair RCA 6CG7 6FQ7 Vacuum Tubes With Shields NOS-Testing Type 27 By Brand GM-Delco-BRANDED 6AX8 tubes tested toThis 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