Tube DIY Asylum

RE: Unbypassed cathode resistor and feedback

189.122.117.113

In Reply to: RE: Unbypassed cathode resistor and feedback posted by Henry Pasternack on October 26, 2009 at 15:19:28

Jean Hiraga, the French tube guru, wrote a seminal book on "Amplis a lampes" back in 1977.
He had a whole chapter devoted to bias.

The degenerative effect at the cathode is clearly explained in this page;
http://www.bonavolta.ch/hobby/en/audio/t_bas9.htm
Look for the paragraph that starts with automatic Biasing (self bias).
Then read carefully the paragraph that starts wih: This system has a drawback.
Think in terms of local degeneration, not loop feedback.
I hope this helps
http://www.bonavolta.ch/hobby/en/audio/t_bas9.htm (Open in New Window)

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