Stromberg Carlson model 1500

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Stromberg Carlson model 1500

Post by Ed in W. PA on Sun Apr 06, 2014 12:44 am

I have a couple of questions about this set. One, what is the function of the capacitor and resistor that connect the B- line to the chassis? In this model they are a 220k resistor and a .05mfd. @ 400v. cap in parallel. Two, can I use a ceramic cap in place of the wax coated paper cap in this application? Three, the scematic shows a dial lamp in this circuit but I can't find any trace of it ever being there. Does anyone have this or a similar with a dial lamp or know where and how it mounts?
Thanks, Ed

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Re: Stromberg Carlson model 1500

Post by willy3486 on Sun Apr 06, 2014 7:53 pm

I am not familiar with this radio but I am guessing its a line filter cap.To make it safer and to filter interference from the line.Maybe someone else can chime in. As far as replacement I use epoxy dipped caps if I can find them,the ceramic caps I use usually have epoxy on them. I mainly match the voltage or better and the farad rating. Usually if it is 1 mf or better I use electrolytic caps and anything below a epoxy or similar. This post makes me wonder if you can even get wax caps anymore?

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Stromberg Carlson model 1500

Post by Ed in W. PA on Sun Apr 06, 2014 9:17 pm

I think what I need is to research the internet for a tutorial on capacitors. The thing I need to know is what is the difference between a .05mfd @ 600v metalized polyester film capacitor and a .05mfd @ 600v mylar, or silver mica, or ceramic disc, ect. I am sure that there must some reason for all the variations in capacitor design such as tolerance and temperature concerns, but in a AA5 radio isn't .05 @ 600 going to do the same thing no matter what type of capacitor one uses?

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Re: Stromberg Carlson model 1500

Post by willy3486 on Sun Apr 06, 2014 9:36 pm

From my experience you can interchange them. I have found if it is a good cap it works. That doesn't mean there are caps out there that won't due to what it is made of or how it is made. I just use what I have and it is usually the epoxy dipped type. I have used types that were used on my stuff but it was because it was all I had on hand and wanted to fix it then and not wait until I needed to place a order.

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Stromberg Carlson model 1500

Post by Ed in W. PA on Sun Apr 06, 2014 9:56 pm

Thanks for the reply. Once I have satisfied my curiosity I hope to post the results.

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Stromberg Carlson model 1500

Post by Ed in W. PA on Sun Apr 06, 2014 11:57 pm

In answer to my own question I have concluded that due to temperature stability, tolerance, drift, and changes in capacity due to changing frequency th
e best choices for radio restoration would be metalized polyester film types. Also equally useful are polyester film and epoxy types.
Thanks for bearing with me, Ed

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