Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods 6HS5 Duodecar

Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods 6HS5 DuodecarThis 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

new old stock brands are boxed by a contractor

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

It has a short base

There is a crack in the base

new in box milspec JAN-CKR-9006 / JRC-9006 9006 tubes tested to spec on our Paul Hart-calibrated TV7/U

As many of you use just the triode section

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

72 and 75 respectively

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

Both have REI date codes

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

Transconductance measured 82 for Tube One (6AU6A) and 84 (6AU6) for Tube Two where minimum (65%) is 58