RE: Reducing gain level

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In Reply to: RE: Reducing gain level posted by horneyMike on March 5, 2008 at 12:59:59:

Hallo Mike, I personally find "global negative feedback" (out of the OPT back to the cathode of the first stage) extremely difficult to do properly (it took me several months to realize I didn't know how to do it...) Local feedback, OTOH, can be quickly implemented by taking out the by-pass capacitor from the cathode of the input tube. This reduces gain, reduces distortion. And since the feedback is only within the very short path inside the tube, no fear of phase shift. Depending on the frequency of that "hum" it could come from various sources. But in all likelihood, an inadequate power supply filtering.

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Follow Ups Full Thread

Topic - Reducing gain level - horneyMike 19:08:06 03/03/08 (4)

RE: Reducing gain level - mbhcid 17:49:36 03/04/08 (0)

RE: Reducing gain level - GTCharlie 19:19:40 03/03/08 (2)

RE: Reducing gain level - horneyMike 12:59:59 03/05/08 (1)

RE: Reducing gain level - GTCharlie 17:17:32 03/05/08 (0)

Follow Ups

RE: Reducing gain level - GTCharlie 17:17:32 03/05/08 (0)

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