Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes NOS NIB Mini Mite 2013 shiny black plates and copper

shiny black plates and copper support rods

crenelated rectangular mica spacers

This lot of three new old stock

I do not recommend them for applications with vibration

micromhos)

Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes NOS NIB Mini Mite 2013 shiny black plates and copperThis matched pair of new old stock, new in box (for Tube Two) GE 12SN7GT dual triodes was tested on our Jackson 648 Mutual Conductance tester for shorts, gas, microphonics and transconductance. There were no shorts or gas. Transconductance measured 112% 114% for Tube One and 114% 115% for Tube Two. (New 6SN7s typically test from 2600 micromhos and the Jackson expresses this in terms of a percentage.) These tubes have lyre shaped getters; short bases;