Matched Pair RCA 12SN7 12SN7GTB Vacuum Tubes Stereo LP-1973 35 and 37 where minimum

35 and 37 where minimum (65%) is 25

It measured 56/49 where minimum (65%) is 40/40 and 100% is 62/62

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

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

Matched Pair RCA 12SN7 12SN7GTB Vacuum Tubes Stereo LP-1973 35 and 37 where minimumThis 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,