Matched Pair RCA 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing 1D8 Gride Cap These four GE 25L6GT tubes

These four GE 25L6GT tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Tube Two (diodes): 60/42

Tube Two Transconductance: 2750

Bottom: smooth

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

Matched Pair RCA 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing 1D8 Gride Cap These four GE 25L6GT tubesThis 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