Baldwin Select Sylvania 12AU7 12AU7A ECC83 Vacuum Tube Valve With An Introduction Transconductance measured 58 for Tube

Transconductance measured 58 for Tube One and 59 for Tube Two where minimum (65%) is 40

This industrial-grade GE 6679 / 12AT7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

but that was the fashion back in the 1940s

This matched pair of Hytron gray glass 6V6GT output tubes was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -36 volts for shorts

Baldwin Select Sylvania 12AU7 12AU7A ECC83 Vacuum Tube Valve With An Introduction Transconductance measured 58 for TubeThis Sylvania MANUFACTURED, Baldwin BRANDED and SELECTED 12AU7A ECC82 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured an almost perfectly balanced 82 84 where minimum (65%) is 56 56 and 100% is 86 86. This tube has narrow, gray, 16 MM plates; excellent flashing; a top, O getter; copper support rods; excellent silkscreening and 312 132 provenance date