General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced Hytron Black Plate dark-gray bottles and bottom

dark-gray bottles and bottom

It measured 40/40 where minimum (65%) is 40/40 and 100% is 62/62

Tube One measured 55 while Tube Two measured 60

This new old stock-testing matched trio of RCA 6FQ7 / 6CG7 dual triodes was tested on our TV7/U for shorts

These tubes have gray plates and nice flashing

General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced Hytron Black Plate dark-gray bottles and bottomThis new old stock, new in box, industrial grade GE triple mica 6201 (12AT7 ECC81) dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured an absolutely, incredibly super rare, perfectly balanced 70 70 where minimum (65%) is 50 50 and 100% is 77 77. This happens perhaps once maybe twice per decade! This variety has copper support rods; gray plates; two additional, vertical