General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced Hytron Black Plate Tube One measured 55 while

Tube One measured 55 while Tube Two measured 60

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

These tubes have gray plates and nice flashing

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

General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced Hytron Black Plate Tube One measured 55 whileThis 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