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Variable output impedance tone control

Posted 6th August 2013 at 04:43 AM by homeskillet (Journey to the Center of the Circuits of Homeskillet)
Updated 28th August 2013 at 01:49 AM by homeskillet (It's a goofy idea and best left alone.)

Aug. 27th, 2013 edit:
Tapping the output transformer as a balanced secondary is totally goofy as was determined by Osvaldo de Banfield and Cnpope (Chris) here:
http://www.diyaudio.com/forums/tubes...madness-2.html

I'll leave it posted here just to show that I'll try just about anything and to show that it's unwise.

Aug. 7, 2013 edit:
I was just looking for the Hawksford and Mills current amp paper on google and I found this very blog post so I thought I would point out a potential drawback to the following feedback technique. Hawksford and Mills claim that using a sense resistor to the ground return from the speaker introduces a distortion similar to "interface distortion" in voltage amplifiers.

There is very little I could find about interface distortion.

As far as I can see it, this feedback scheme may introduce back emf from the speaker and feed it back to the amp...
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