Thread: 91 XG Modified
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Old 14-Jun-2020, 10:43 PM   #28
OTAFAN
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Join Date: Apr 2015
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Quote:
Quote:
Originally Posted by Sev View Post
Jeff Kitz has shown that it is possible to create low noise preamp. Then there is Winegards LNA-100. Also very low noise.
I would imagine a portion of the noise is being generated by the PSU.
The 3 capacitors @ C7, C13 and C28 would be suspect as well.
An old tip that was passed on to me decades ago by an electronics audiophile, was to replace all the CAPS in the audio path of an AM/Shortwave (or any other) radio with non-polarized CAPS to enhance the clarity and lower the noise floor of the receiver. I can say it always improved my audio with less aural fatigue. I think some high end receivers in the past have also used non-polarized CAPS in their audio paths.

I haven't tried it in situations like this thread is addressing, but I suspect it might be worth experimenting to lower noise.

One advantage of non-polarized CAPS is that is doesn't matter which way you solder them in.

Also, they're not too expensive as compared to regular CAPS and can still be bought at places like Mouser Electronics:

https://www.mouser.com/Search/Refine...zed+capacitors

You Techs here are above my pay grade, but I hope this might be of some help.

Last edited by OTAFAN; 15-Jun-2020 at 7:42 AM. Reason: additional
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