Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes NOS-Testing 5 Tung-Sol

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes NOS-Testing 5 Tung-SolThis 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 72 for Tube One and 74 for Tube Two where minimum (65%) is 58. I am playing them in my Musical Paradise MP 3 single ended integrated amplifier (with adapters, not included) with Aimee Mann's seminal "Magnolia" album and they sound terrific. These tubes

top D getters

Transconductance measured 2000/1900 micromhos for Tube One and 2000/2000 micromhos for Tube Two

I have played them in my Radio Craftsmen RC-2 monoblocks and they sound great

These four Sylvania-MANUFACTURED 6U7G tubes were tested on our Paul Hart-calibrated TV7/U for shorts

This pressing has light surface noise audible in quiet passages and barely audible in voice-level passages

I am glad I've lived to see it

new in box Realistic (Radio Shack) Gold Clad 6EA8 tube tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 56 for Tube One and 57 for Tube Two where minimum (65%) is 40

These are ultra-low-noise

These two milspec Chatham Electronics 6H6 / JAN-CAHG-6H6-WGT tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box GE 12AV6 tubes tested to spec on our Paul Hart-calibrated TV7/U

These seven Philco number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U