Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament April 27 2022 44/50 and 52/50 where minimum

44/50 and 52/50 where minimum (65%) is 40/40 and 100% is 62/62

280 739 and F1 date codes

These links came from the Vostok Amphibia and

It measured a nearly-perfectly-balanced 84/82 where minimum (65%) is 50/50 and 100% is 77/77

new in box RCA 12BZ7 tube tested to spec on our TV7/U

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament April 27 2022 44/50 and 52/50 where minimumThis 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 67 73 for Tube One and 68 72 for Tube Two. (Minimum (65%) is 50 50.) They have additional filaments across the top tube for an enhanced light show; side O getters; copper support rods; a round and square hole in each mica spacer; great flashing and SH 188 5 and LK 188 5