Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes Valves NOS-Testing RCA Vinyl Stereo 4 dB (-92 dB is

4 dB (-92 dB is the Maxi-Matcher's noise floor)

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

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

new in box Sylvania 14C5 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes Valves NOS-Testing RCA Vinyl Stereo 4 dB (-92 dB isThis 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