Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes Valves NOS-Testing Matched Pair 6AX4 This matched pair of RCA

This matched pair of RCA 6FQ7 / 6CG7 dual triodes was tested on our TV7/U for shorts

280 739 and F1 date codes

This matched pair of milspec Chatham Electronics 6H6 / JAN-CAHG-6H6-WGT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

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This Amperex 8020 half-wave rectifier tube was tested on our Paul Hart-calibrated TV7/U

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes Valves NOS-Testing Matched Pair 6AX4 This matched pair of RCAThis new old stock testing matched pair of Sylvania 6AU6A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 74 for Tube One and 76 for Tube Two where minimum (65%) is 58. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier (with adapters, not included) with Aimee Mann's seminal "Magnolia" album and they sound terrific. These tubes