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RE: Eli, I keep reading divergent views for the film cap...

Posted by Eli Duttman (A) on December 22, 2014 at 18:37:10

In Reply to: RE: Eli, I keep reading divergent views for the film cap... posted by gkargreen on December 22, 2014 at 17:10:19:

The generalization is flawed. Consider a choke I/P filter. A large value, low ESR, 'lytic after the I/P choke is fine, regardless of rectifier technology. Remember that per older additions of the ARRL Handbook, LCLC is the way to go. A cap. that feeds small signal tube plates is an excellent candidate for metalized polypropylene film. Save the film and foil parts for signal path duty.

Given the intolerance of vacuum rectifiers to large valued cap. I/P filters, a MKP part as the I/P cap., when vacuum rectification is employed, makes sense. Dielectric absorbtion and other losses have to be minimized. Whatever energy is stored needs to be available.


Eli D.

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