Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods May 31 2025 Tube One: 31

Tube One: 31

There were no shorts or gas and it measured 42 where minimum (65%) is 26

100% is 77/77

This almost-perfectly-matched pair of Sylvania black plate 6C4 triodes was tested on our Paul Hart-calibrated TV7/U for shorts

perfectly-matched pair of RCA black plate

Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods May 31 2025 Tube One: 31This matched pair of General Electric 12AU7A ECC82 dual triodes was tested on our Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 1800 1750 micromhos for Tube One and 1800 1775 micromhos for Tube Two. (New 12AU7s typically test within one standard deviation of 2200 micromhos. Minimum (65%) is 1430.) These tubes have narrow 19 MM plates, each with three rectangular holes; O getters; copper