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In Reply to: RE: The distortion consequences of GNFB posted by 6AS7_6SN7 on May 13, 2017 at 09:55:36
This diagram shows distortion of a (presumably) single-ended triode amp at full power. It's important to understand that distortion falls as the power goes down, and that higher harmonics fall faster than lower ones. That adds a third dimension, not shown in the diagram but important to music listening.
Talking of listening though, there were many studies going back to the thirties attempting to understand what distortion people could hear. It was widely accepted and backed up by many such experiments that higher harmonics were more audible at even very low levels.
Follow Ups:
" The problem with using THD as a yardstick of quality is the order of the distortion term has a far more audible effect than its absolute magnitude. "
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Local NFB can deliver some quite good results. Going balanced in the NFB circuit offers even better results.
The Plate-to-Grid, either implemented via Schade's circuit, or through use of taps along the primary( E-Linear ) both deliver a lowered source impedance, and increased linearity of the amplifying element w/o a long path plagued with phase shifts.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Naz
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