Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes ECC81 TV7

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes ECC81 TV7This 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 66 for Tube One and 70 for Tube Two where minimum (65%) is 58. These tubes have top, O getters; gray plates and excellent flashing. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier (with adapters, not included) with Aimee Mann's seminal

It measured an outstanding and nearly-perfectly-balanced 92/93 where minimum (65%) is 50/50 and 100% is 77/77

Tube Two (diodes): 60/42

new in box RCA 12AJ6 tube tested to spec on our Paul Hart-calibrated TV7/U

25 out of ten

a crenelated

nostalgic Coke bottle shape highlighted by its dark-gray and silver coatings

new in box Zenith 6LT8 tube tested to spec on our Paul Hart-calibrated TV7/U

Tube Two: 46/48

It has a side

US-made 5BQ7A tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box US-made 12D4 tubes tested to spec on our Paul Hart-calibrated TV7/U

The Bottlehead calls for a 12AU7 which is a pretty-different tube