Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods May 31 2025 GM-BRANDED 6SK7 tested as good

GM-BRANDED 6SK7 tested as good on our Paul Hart-calibrated TV7/U

Tube One: 31

SOME COUNTRIES DO NOT HAVE INTERNAL TRACKING

100% is 77/77

new in box GE 12AV6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods May 31 2025 GM-BRANDED 6SK7 tested as goodThis 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