Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filaments NOS NIB Hytron 6V6GT They measured 28/30

They measured 28/30

foil getters and cross-shaped-top and rectangular-bottom spacers

55 and 59 where minimum (65%) is 40

Tube Two measured 25

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filaments NOS NIB Hytron 6V6GT They measured 28/30This new old stock, new in box 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 76 78 for Tube One and 77 82 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have additional filaments across the top of the tube for an enhanced light show; side O getters; copper support rods; a round and square hole in each