Matched Pair RCA 12SN7 12SN7GTB Vacuum Tubes Stereo LP-1973 This perfectly-matched pair of Ken-Rad

This perfectly-matched pair of Ken-Rad 6SL7GT dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

I’ve never met a von Karajan completist as Karajan was just too prolific for any normal human to be a von Karajan completist

This  pair of National Union black plate 45 output triode was tested on our Paul Hart-calibrated TV7/U for shorts

Plate current draw was 29

new in box milspec black plate GE JAN-6Y6GT / JAN-CG-6Y6GT tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair RCA 12SN7 12SN7GTB Vacuum Tubes Stereo LP-1973 This perfectly-matched pair of Ken-RadThis matched pair of RCA 12SN7GTB dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and transconductance measured as follows: Tube One: 63 64 Tube Two: 66 60 Bogey: Minimum (65%) is 50 50; 100% is 77 77 Physical Characteristics: Bases: tall Bottles: medium height Date Codes: 3 48 and 4 35 EIA Factory Codes: RCA logo; 274 Getters: bottom, D Flashing Quality: N A Mica Spacers,