Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing 12EQ7 NOS NIB Transconductance measured 81/82 for Tube

Transconductance measured 81/82 for Tube One and 84/83 for Tube Two where minimum (65%) is 50/50 and 100% is 77/77

new in box RCA-MANUFACTURED

This lot of three RCA 6SF7 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

perfectly-balanced 70/70 where minimum (65%) is 50/50 and 100% is 77/77

This is a very-well-preserved LP

Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing 12EQ7 NOS NIB Transconductance measured 81/82 for TubeThis 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 and 84 for Tube Two where minimum (65%) is 58. These tubes have top, U getters; gray plates and excellent flashing. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier (with adapters, not included) with Aimee