Lansdale 12AU7 / ECC82 Vacuum Tube 17MM Black Plates Copper Support Rods Early Production 12DB5 Nonal T13 3 milliamps' plate current and

3 milliamps' plate current and measured 2060 micromhos

This  pair of National Union black plate 45 output triode was tested on our Paul Hart-calibrated TV7/U for shorts

This lot of two (one 12K7G and one 12K7GT) National Union 12K7 tubes tested to spec on our Paul Hart-calibrated TV7/U

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

This trio of RCA gray glass 12BY7 / 12BY7A tubes was tested on our Paul Hart-calibrated TV7 for shorts

Lansdale 12AU7 / ECC82 Vacuum Tube 17MM Black Plates Copper Support Rods Early Production 12DB5 Nonal T13 3 milliamps' plate current andThis 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