Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Valves Copper Support Rods NOS NIB June 11 2024 hydrofluoric acid-etched GE provenance dots

hydrofluoric acid-etched GE provenance dots and excellent flashing

9 milliamps

It measured 82/91 where minimum (65%) is 50/50 and 100% is 77/77

new in box milspec RCA 3Q4 / JAN3Q4 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box Realistic (Radio Shack) Gold Clad 3V4 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Valves Copper Support Rods NOS NIB June 11 2024 hydrofluoric acid-etched GE provenance dotsThis new old stock, new in box, nicely matched pair of General Electric 12AU7 ECC82 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 73 75 while Tube Two measured 75 76 where minimum (65%) is 56 56 and 100% is 87 87. These tubes have narrow 19 MM plates, each with two rectangular holes; O getters; copper support rods and excellent flashing. I have played them