[Boatanchors] Theory Question

[Dennis DuVall]

Now, that makes sense.  Been in the game since the 50’s, though, and don’t remember seeing that kind of a paper/mica combination used anywhere else.
Don’t remember seeing the combo in regens back in the “day” either which might explain why the circuits found in "Popular Mechanics" and "Radio News" didn’t 
always work as advertised.   :^(

Dennis D.  W7QHO
Glendale, CA

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> On Jul 29, 2015, at 10:07 AM, Michael Bittner <mmab at cox.net> wrote:
> 
> 
> You will often see two parallel bypass caps for the screen grid of regenerative receivers that control regeneration by varying the screen grid voltage with a potentiometer.  The purpose of the smaller of the two caps (anything from 100 pF to 500 pF) is to bypass the screen grid for RF since the larger one may become inductive at RF.  The larger of the two (typically 0.1 uF to 0.5 uF) is for bypassing the screen grid for audio and especially for the scratchy noises that may be produced by the pot.