Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods 6HS5 Duodecar new old stock brands are

new old stock brands are boxed by a contractor

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

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

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

Both have REI date codes

Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods 6HS5 Duodecar new old stock brands areThis 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