Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes NOS-Testing

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes NOS-TestingThis 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

TV7/U readings are in (parenthesis)

This matched pair of Philips PCL805 tubes was tested on our Paul Hart-calibrated TV7/U

2 for Tube Two

This hardcover book is in excellent / like-new condition

respectively where minimum (65%) is 56/56 and 100% is 86/86

new in box GE 3CB6 tube tested to spec on our Paul Hart-calibrated TV7/U

and their top mica spacers have two X patterns incised into them

new in box 7Q7s tested to spec on our Paul Hart-calibrated TV7/U

This offering is for two subminiature spring-loaded X-ray suppression shields and their bases are suitable for 6AU6-size tubes

stout gray plates

Fortunately the libretto is present and in great shape

This RCA 1B3GT / 1G3GT tube tested to spec on our Paul Hart-calibrated TV7/U