Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing Compactron T08o These four US-made 6AB4 tubes

These four US-made 6AB4 tubes tested to spec on our Paul Hart-calibrated TV7/U

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

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

5 record cleaner and then played it on my Rega Planar Threes

It sounds fair to middlin'

Matched Pair Sylvania 6AU6 Vacuum Tubes NOS-Testing Compactron T08o These four US-made 6AB4 tubesThis 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