Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods 6HS5 Duodecar new in box nearly-perfectly-matched pair

new in box nearly-perfectly-matched pair of GE-MANUFACTURED 6FQ7 / 6CG7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

on our Paul Hart-calibrated TV7/U where minimum (65%) is 40/40 and 100% is 62/62

These six US-made 5U8 tubes tested to spec on our Paul Hart-calibrated TV7/U

There is a crack in the base

This matched pair of General Electric 12AU7/ECC82 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods 6HS5 Duodecar new in box nearly-perfectly-matched pairThis matched pair of GE 12AU7 ECC82 dual triodes was tested on our Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 1950 1950 micromhos for Tube One and 2000 2000 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 two rectangular holes; O getters; copper support rods and good