Quite an interesting valve here, on Thomas Mayer's site :
http://vinylsavor.blogspot.co.uk/2017/0 ... h-7b4.html
Low current, high gain, like an ECC83, but one section per valve.
Plate ( anode ) is cylindrical though - might have advantages in distortion , like the very good-sounding 6P5 and 76.
I can imagine using this after an RIAA section in a phono, followed by a CF buffer for the output.
If they glow, this is the place to be
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