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In Reply to: RE: 'it is not the same tube internally' posted by Jim Dowdy on November 23, 2014 at 14:01:56
Lots of tubes are different when you wouldn't expect them to be:
i.e. 6N7 is different than the 6SN7
the 6Q7 has a lower mu than the 6SQ7
The 6J7 has a lower transconductance than the 6SJ7, and better linearity
Probably the 6SJ7 is better optimized for RF use.
Follow Ups:
I hear you - but I'm still unconvinced that the biggest difference is not (all but) eliminating the grid to plate capacitance.
The data sheets show the same .005pF control grid to plate.I must not be understanding this thread.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 11/23/14
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