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 Post subject: Factory installed wrong electrolytic can in Magnavox CR216?
PostPosted: Jun Mon 17, 2019 7:40 pm 
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Location: San Francisco, CA
I'm still working on recapping my Magnavox CR216 chassis and I noticed it appears the factory installed the wrong electrolytic capacitor can.

The parts list and schematic shows: 10-10mmf. 450V - 20mmf 25V
But the chassis has installed: 20 -10mmf. 450V - 20mm 25V

Any idea why the factory would have installed the 20mmf rather than the 10mmf as specified on the drawing and parts list? Should I install a 10mmf, 20mmf, or split the difference with a 16mmf capacitor? This capacitor can sits between the 1st A-F and the Inverter, so I'm not sure how critical this value is.


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 Post subject: Re: Factory installed wrong electrolytic can in Magnavox CR2
PostPosted: Jun Mon 17, 2019 8:14 pm 
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Joined: Feb Thu 28, 2019 7:48 pm
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Location: Lawrenceville, Illinois 62439
Just a note: You're saying "mmf", which is a whole lot different than "mfd". We know what you mean though.
Could very well be a production change, mid-run, to modify/correct an issue.
If it were me, I'd go with a 22mfd ("uf" nowadays) at 450v, and not lose any sleep over it.
Dan


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 Post subject: Re: Factory installed wrong electrolytic can in Magnavox CR2
PostPosted: Jun Mon 17, 2019 8:16 pm 
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Location: Austin, Texas
The value isn't critical. I would replace it with a 20uF or larger. There is a good possibility that your radio is a later model and they made the change to reduce hum. Except for the cap at the rectifier, you can normally go higher in value with no problems.

Jay


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 Post subject: Re: Factory installed wrong electrolytic can in Magnavox CR2
PostPosted: Jun Mon 17, 2019 8:20 pm 
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Thanks, I got carried away with the "m's" You are correct, I'm meant to type "mfd / uf". I've got a 22 mfd cap that I could install.


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 Post subject: Re: Factory installed wrong electrolytic can in Magnavox CR2
PostPosted: Jun Mon 17, 2019 9:11 pm 
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Location: Beaver Falls, PA. USA
As I may have mentioned before, it's not uncommon to find parts and tube substitutions in 1946-52 sets, due to shortages. Not all of them made it into the service literature.

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Tim KA3JRT


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 Post subject: Re: Factory installed wrong electrolytic can in Magnavox CR2
PostPosted: Jun Mon 17, 2019 10:29 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
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Location: Long Island
It's not out of the question that when the set left the factory, the capacitor matched the schematic and parts list, but it failed and was replaced with the one that is there now.

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"Hell, there are no rules here--we're trying to accomplish something!"

Thomas A. Edison


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 Post subject: Re: Factory installed wrong electrolytic can in Magnavox CR2
PostPosted: Jun Mon 17, 2019 11:27 pm 
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I didn't see any signs that this capacitor can had ever been replaced by a tech. If so, they did a factory looking installation with no scratch marks showing the previous removal / bending tabs, etc. Has anyone else recapped a CR216 and observed this possible factory change from 10 mfd to 20 mfd? Since this is a triple electrolytic capacitor can, I was assuming this was probably an engineering change that wasn't well documented rather than the someone at the factory or a service tech installing the wrong electrolytic can.


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 Post subject: Re: Factory installed wrong electrolytic can in Magnavox CR2
PostPosted: Jun Mon 17, 2019 11:33 pm 
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Location: Sanford Fla 32771
Quote:
it's not uncommon to find parts and tube substitutions in 1946-52 sets

End of WWII, lots of shortages, substitution was probably very common.

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Paul of Florida


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