NEC 6SN7 6SN7GTB Vacuum Tube NOS-Testing Leo Sayer terrific flashing and L2E date

terrific flashing and L2E date codes

These eight US-made 6BQ6 / 6CU6 tubes tested as follows on our Paul Hart-calibrated TV7/U:

3 milliamps while Tube Two’s was 28

They measured 44 and 48 where minimum (65%) is 30

GE-branded 6DA5 / EM-81 indicator tube tested to spec on our Hickok 800

NEC 6SN7 6SN7GTB Vacuum Tube NOS-Testing Leo Sayer terrific flashing and L2E dateThis 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