Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament April 27 2022 new in box RCA 12BZ7

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

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

excellent flashing and O getters

This perfectly-matched pair of milspec GE 6C4 6C4WA triodes was tested on our Paul Hart-calibrated TV7/U for shorts

These links came from the Vostok Amphibia and

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament April 27 2022 new in box RCA 12BZ7This 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