Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes Valves

Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes ValvesThis matched pair 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 63 67 while Tube Two measured 66 66 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 adapters (not included) in my Radio Craftsmen RC 2

Transconductance measured 46/49 where minimum (65%) is 25 and 100% is 38/38

double-D getters and anode radiators for cooler operation and longer life

52/48 and 52/52 where minimum on the TV 7 (65%) is 38/38

These tubes have lyre-shaped getters

new in box Osram N108 tube tested to spec on our Paul Hart-calibrated TV7/U

5 volts with adapters (not included) and they sound tremendous even though they straddle the cusp and are running with a lowered filament voltage

(Minimum (65%) is 46

These nine National Union number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

anode radiators for cooler operation and longer tube life

Transconductance measured 116%/104% where minimum (65%) is 70%/70%

new in box matched pair of Tung-Sol 12SL7 / 12SL7GT dual triodes was tested on our Pau Hart-calibrated TV7/U for shorts

56/58 and 64/64