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

Tube One: 31

new in box CBS 12DB5 tube tested to spec on our Paul Hart-calibrated TV7/U

68 and 71 where minimum (65%) is 46

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

This new old stock-testing RCA clear top 6CG7 / 6FQ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

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