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 Post subject: Recapping a Hallicrafters S120
PostPosted: Feb Sun 12, 2012 8:23 am 
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Joined: Jan Sun 23, 2011 2:48 am
Posts: 88
I have a Hallicrafters S120 I would like to finish recapping. I already replaced the chassis mounted multi-lead electrolytic capacitor with three electrolytic caps under the chassis and the radio works pretty well now, no hum anymore which was really bad before.
In digging through Mouser, I didn't find electrolytic caps of the values that need to be replaced elsewhere in the receiver.
I did find "orange drop" capacitors of the correct values but I don't believe that they are caps with any polarity.
Is that going to be an issue with recapping older stuff like this?
My guess is that it is but that is just a guess. Is there a particular type of capacitor that is generally used to replace old electrolytic, paper, oil filled, and "bumble bee caps" or general rule of thumb to go by when looking for replacement capacitors?
It is my first restoration and a learn as I go kind of project.


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Sun 12, 2012 3:48 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12294
Location: Albuquerque, NM 87123
Orange drops will not have a polarity; you can use them to replace the oil filled, paper and bumble bee caps.


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Sun 12, 2012 4:47 pm 
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Joined: Oct Thu 27, 2011 8:39 pm
Posts: 419
Location: Houston, texas
The old 'paper' capacitors would be rolled up with the foil on the outside and would supposedly provide shielding, that end would normally be connected to ground with a mark on the end. Of course this capacitor would work connected up either way.
Modern capacitors of that value are not made that way anymore.


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Mon 13, 2012 1:22 am 
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Joined: Jan Sun 23, 2011 2:48 am
Posts: 88
Thanks for all the info.
I have also heard that some people use Panasonic metalized polypropylene capacitors for replacements. Are they all that different or more preferred to the orange drop capacitors?


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Mon 13, 2012 8:58 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12294
Location: Albuquerque, NM 87123
I prefer orange drops simply because they seem to last forever, but the Panasonics are OK.


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Mon 13, 2012 2:14 pm 
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Joined: May Sat 22, 2010 4:42 pm
Posts: 2975
You have to be careful applying the ultra-compact metallized caps-- they're all designed for the 99.9% of modern applications where they're used as BYPASSES, in low impedance circuits, not for coupling.

The way they get them to be so small physically is to use ultra-thin insulation, which periodically shorts through and if there's enough current available, the metallization short vaporizes. This works well enough in any bypass situation. Not so well when used as a signal coupler.


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Mon 13, 2012 4:47 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3943
Location: Gainesville, Florida
check the resources thread for parts

_________________
CAUTION: Im no expert

DISCLAIMER: Not responsible for knowledge or lack thereof


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Thu 16, 2012 7:39 pm 
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Joined: Oct Fri 07, 2011 4:29 pm
Posts: 40
Tom at Hayseed Hamfest has a complete cap kit for that radio. I use him all the time for recap projects. Fast, Friendly and Affordable.

http://www.hayseedhamfest.com/capacitor ... p_Kit.html


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 Post subject: Re: Recapping a Hallicrafters S120
PostPosted: Feb Wed 22, 2012 5:21 am 
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Joined: Jan Sun 23, 2011 2:48 am
Posts: 88
Thanks for all the info and the heads up on Hayseed Hamfest.
It is as much a project for learning about this stuff as it is for getting it working well.


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