General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced Hytron Black Plate These tubes have gray plates

These tubes have gray plates and nice flashing

These two US-made 14A4 tubes tested to spec on our Paul Hart-calibrated TV-7/U

Mica Spacers

Tube Three (triode): 51

General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced Hytron Black Plate These tubes have gray platesThis 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