NEC 6SN7 6SN7GTB Vacuum Tube NOS-Testing October 28 2024 a D getter and black

a D getter and black plates

tall bottles

a riveted-disk getter

It was manufactured in the Soviet Union as it has 74-36 date codes

This pressing has very-light to light surface noise audible in quiet passages

NEC 6SN7 6SN7GTB Vacuum Tube NOS-Testing October 28 2024 a D getter and blackThis new old stock testing NEC MANUFACTURED, Channel Master LABELED 6SN7GTB was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured a perfectly balanced 81 81 where minimum (65%) is 50 50 and 100% is 77 77. This tube was made in Japan for Channel Master in the early to mid late 1970s and has copper support rods; a short base; a tall bottle; gray plates; a top D getter