3 Lansdale 12AU7 / ECC82 Vacuum Tubes 17MM Black Plates Copper Support Rods Early Production Lot Of Three Organ Music This milspec / industrial-grade RCA

This milspec / industrial-grade RCA black plate 6189 / JAN-CRC-12AU7WA / 12AU7 dual triode was tested on our Maxi Preamp II for shorts

engraved bases and narrow rectangular mica spacers

It was manufactured in the Soviet Union

-- GE 6L6GC output tube was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

3 Lansdale 12AU7 / ECC82 Vacuum Tubes 17MM Black Plates Copper Support Rods Early Production Lot Of Three Organ Music This milspec / industrial-grade RCAThis lot of three Lansdale (Philco's in house tube manufacturing arm) 12AU7 ECC82 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 50 68, 58 72 and 65 66 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