Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes Valves NOS-Testing RCA Vinyl Stereo This Sylvania 5V4GA rectifier tube

This Sylvania 5V4GA rectifier tube tested 55/55 on our Paul Hart-calibrated TV7/U where minimum (65%) is 40/40

This lot of three Sylvania tall base

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

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 This Sylvania 5V4GA rectifier tubeThis 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