Matched Pair RCA 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing 1D8 Gride Cap Bottom: smooth

Bottom: smooth

Tube Two (diodes): 60/42

25K center-tapped interstage transformers is sold as-is as I have no means of testing it

Tube Two Transconductance: 2750

Plate current measured 67

Matched Pair RCA 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing 1D8 Gride Cap Bottom: smoothThis 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