Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing Compactron T08o The GM-LABELED ones all have

The GM-LABELED ones all have 312 Sylvania EIA codes

It sounds fair to middlin'

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

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

Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing Compactron T08o The GM-LABELED ones all haveThis 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