Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes NOS-Testing 60-08063-64a 47 and 48 where minimum

47 and 48 where minimum (65%) is 30 and 100% is 72

They were cleaned on my VPI 16

This new old stock-testing matched pair of Sylvania 6AU6A tubes was tested on our Paul Hart-calibrated TV7/U for shorts

One is simply labeled "XXFM

This matched pair of RCA Cunningham Radiotron Type 49 output tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes NOS-Testing 60-08063-64a 47 and 48 where minimumThis new old stock testing matched pair of Sylvania 6AU6 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 82 for Tube One (6AU6A) and 84 (6AU6) for Tube Two where minimum (65%) is 58. These tubes have top, D getters; gray plates; copper support rods and excellent flashing. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier (with