Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing March 30 2025 It is dead quiet when

It is dead quiet when the preamp is muted and have excellent frequency response and dynamics

new in box RCA 6H6 tube tested to spec on our Paul Hart-calibrated TV7/U

excellent flashing and top O getters

phi-shaped top mica spacer

Lancashire in the first week of November

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing March 30 2025 It is dead quiet whenThis new old stock TESTING matched pair of GE 6SN7GTB dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 82 79 for Tube One and 80 81 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have side, harp getters; copper support rods; great flashing and 56 26 188 4 and 58 13 188 5 date factory codes, respectively. I have played them in my