Thanks to Jerry and everyone else who contributed.  The model painted on the enclosure says “KS-5928 L7” the L7 I am assuming indicates “List 7” the diagram for which, found in the pdf Jerry unearthed is this:

Looks very simple and confirms Germanium Rectifier. Interestingly, some of the other “list” versions of this same model PS do show Selenium. I have to brush up on identifying them properly.

Thanks everyone!

73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

From: Jerry Murphy <[email protected]>
Sent: Friday, November 25, 2022 11:26 PM
To: John W9DDD <[email protected]>; W2HX <[email protected]>
Cc: Greenkeys <[email protected]>
Subject: Re: [GreenKeys] KS-5928 L7 loop supply?

Wiring diagram can be found at:  

https://navy-radio.com/manuals/tty/570-302-400-6412.pdf

Jerry Murphy

-----Original Message-----
From: John W9DDD <[email protected]>
Sent: Nov 25, 2022 4:46 PM
To: W2HX <[email protected]>
Cc: Greenkeys <[email protected]>
Subject: Re: [GreenKeys] KS-5928 L7 loop supply?

I remember finding a document covering several KS power supplies, I thought on navy-radio, but I can't find it.

John, W9DDD

On Nov 25, 2022, at 5:38 PM, W2HX <[email protected]> wrote:

Hi friends. Found this loop supply in a closet. Anyone recognize it? The AC input plug looks WEIRD! Does not appear to be the same pitch as a regular 2-prong AC plug. Anyone know what it is supposed to plug into? Also, I think this has a selenium stack. Leave as is? See pix (cover removed for the photo).

https://w2hx.com/?prefix=x/TTY/KS-5928/

I am guessing, but would like your input) that the oil filled cap is probably ok but the big electrolytic should be reformed? Or replaced?

Comments/suggestions?

73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

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