Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament NOS NIB 6N1P 3230 3230 They have AC and BM

They have AC and BM date codes

As a survivor of Communist East Germany

Transconductance measured 65/34

This lot of three Sylvania 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

68/62 and 70/60

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament NOS NIB 6N1P 3230 3230 They have AC and BMThis 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 an outstanding 92 93 for Tube One and 94 93 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have additional filaments across the top tube for an enhanced light show; side O getters; copper support rods; a round and square hole