Matched Pair General Electric GE Nickel Plate 6AU6 Vacuum Tubes Valves RCA 2728 These tubes have gray plates

These tubes have gray plates and nice flashing

Transconductance measured 35

I have played it in my Cern Audio phono pre-preamplifier as a 6SL7 substitute (with an adapter

phi-shaped mica spacers

Matched Pair General Electric GE Nickel Plate 6AU6 Vacuum Tubes Valves RCA 2728 These tubes have gray platesThis matched pair of GE nickel plate 6AU6 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 57 for Tube One and 58 for Tube Two where minimum (65%) is 58 and 100% is 89. These tubes have top, harp getters; nickel plates and excellent flashing. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier (with adapters, not included) with