Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes NOS NIB Mini Mite 2013 crenelated rectangular mica spacers

crenelated rectangular mica spacers

new in box matched pair of Hytron 1622 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box milspec GE 6C4 6C4WA triodes was tested on our Paul Hart-calibrated TV7/U for shorts

shiny black plates and copper support rods

new in box GE 6AH6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes NOS NIB Mini Mite 2013 crenelated rectangular mica spacersThis 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;