Matched Pair RCA 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing 1D8 Gride Cap Transconductance measured 68/64 where minimum

Transconductance measured 68/64 where minimum (65%) is 36/36

This new old stock-testing matched pair of Ken-Rad 6SJ7s was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance (Maxi-Matcher): 1877/1882

Transconductance measured 44 and 44 where minimum (65%) is 35

Matched Pair RCA 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing 1D8 Gride Cap Transconductance measured 68/64 where minimumThis new old stock TESTING matched pair of RCA 6SN7GTB 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 82 81 while Tube Two measured 84 78 where minimum (65%) is 50 50. These tubes have black plates; smooth, rectangular mica spacers; copper support rods; standard, bottom, side D getters; short bases and LA and KJ date codes, respectively. I am playing them