Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes ECC81 TV7 The Bottlehead calls for a

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

a crenelated

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

25 out of ten

Tube Two (diodes): 60/42

Matched Pair Sylvania 6AU6 6AU6A Vacuum Tubes ECC81 TV7 The Bottlehead calls for aThis 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