Matched Pair Sylvania 6AU6 Vacuum Tubes Valves NOS-Testing 6AC7 Octal OM2 210 5213 and no provenance/date

210 5213 and no provenance/date codes

MOST OF THE TUBES WE SELL ARE OVER 60 YEARS OLD

These four new old stock

large top and small bottom mica spacers and excellent flashing

Matched Pair Sylvania 6AU6 Vacuum Tubes Valves NOS-Testing 6AC7 Octal OM2 210 5213 and no provenance/dateThis 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