General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced June 06 2023 new in box matched pair

new in box matched pair of Transleteronic 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

balloon / globe Number / Type 36 tubes tested as follows on our Paul Hart-calibrated TV7/U:

I am playing it in my Pro-Ject Tube Box S phono pre-preamplifier (tube on right) with John Mayall’s seminal "The Blues Alone" album

sutured tops

Transconductance measured 35

General Electric GE 6201 12AT7 ECC81 Vacuum Tube Valve Industrial Variety Triple 3 Mica NOS NIB For Your Univalve Perfectly-Balanced June 06 2023 new in box matched pairThis 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