Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes NOS-Testing In Nixon's America new in box Hitachi 12AU7

new in box Hitachi 12AU7 / ECC82 dual triode was tested on both our Paul Hart-calibrated TV7/U as well as our Maxi-Matcher Preamp Tube Tester

they can put out as much as 2A3s and fell into disfavor because of socket supply issues

6 volts on the filaments

incredibly-super-rare

Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes NOS-Testing In Nixon's America new in box Hitachi 12AU7This new old stock testing 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 76 73 while Tube Two measured 79 72 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