Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing March 30 2025 This matched pair of National

This matched pair of National Union milspec output tubes was tested on Paul Hart-calibrated TV7/U for shorts

5 volts with adapters (not included) and they sound tremendous even though they are running with a lowered filament voltage

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

312 026 and 113 EIA/date codes

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

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods NOS-Testing March 30 2025 This matched pair of NationalThis 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