Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes Valves NOS-Testing RCA Vinyl Stereo They are dead quiet when

They are dead quiet when the CD player is paused and have excellent frequency response

These are truce 6CG7s with shields between the triodes for reduced cross talkt

on our Paul Hart-calibrated TV7/U where minimum (65%) is 31 and 100% is 48

new in box RCA 6CG8A tubes tested to spec on our Paul Hart-calibrated TV7/U

perfectly-matched pair of GE 6SJ7s was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes Valves NOS-Testing RCA Vinyl Stereo They are dead quiet whenThis 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