Lansdale 12AU7 / ECC82 Vacuum Tube 17MM Black Plates Copper Support Rods Early Production 12DB5 Nonal T13 This CD played fine in

This CD played fine in my Denon DCD-1650AR

52 and 60 where minimum (65%) is 36 and 100% is 55

new in box 6AH6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 67/73 for Tube One and 68/72 for Tube Two

3 milliamps' plate current and measured 2060 micromhos

Lansdale 12AU7 / ECC82 Vacuum Tube 17MM Black Plates Copper Support Rods Early Production 12DB5 Nonal T13 This CD played fine inThis Lansdale (Philco's in house tube manufacturing arm) 12AU7 ECC82 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 70 64 where minimum (65%) is 56 56 and 100% is 86 86. It has shiny 17MM black plates; copper support rods; excellent flashing; a top slanted D getter and L1E date codes. This is an early production 12AU7 not a 12AU7A like most 12AU7s we see these