Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing Compactron T08o They are microphonic and are

They are microphonic and are fine in the preamp stage of my MP-301 and other gentle environments

This new old stock-testing Sylvania 12AV7 dual triode was tested on our Jackson for shorts

nice flashing and ribbed

The GM-LABELED ones all have 312 Sylvania EIA codes

This tube has anode radiators for cooler operation and longer tube life

Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing Compactron T08o They are microphonic and areThis 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 85 for Tube One and 86 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