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 Post subject: Nordmende chassis 1-613 Cap identifcation
PostPosted: May Thu 30, 2019 1:12 am 
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Joined: Nov Tue 15, 2011 11:19 pm
Posts: 442
Location: Woolwich Twp (Swedesboro), NJ
Below is the listing from the SAMS for C47. It appears to be a dime size ceramic disc that is blown in half. My question is, if the number in pF? I know the other numbers are uF. Those are easy. But 100 with 10% looks like pF. Also, what voltage rating should it be when it is not listed?
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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: May Thu 30, 2019 1:01 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18544
Location: Albuquerque, NM 87123
Yes, pf; 500v.


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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: May Thu 30, 2019 1:38 pm 
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Joined: Nov Tue 15, 2011 11:19 pm
Posts: 442
Location: Woolwich Twp (Swedesboro), NJ
What is typically the default voltage rating when it is not listed?


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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: May Thu 30, 2019 2:14 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18544
Location: Albuquerque, NM 87123
In radios you can assume it's 500 volts.


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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: May Thu 30, 2019 8:15 pm 
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Joined: Nov Tue 15, 2011 11:19 pm
Posts: 442
Location: Woolwich Twp (Swedesboro), NJ
Johnnysan wrote:
In radios you can assume it's 500 volts.



Thanks!


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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: Sep Wed 11, 2019 2:45 am 
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Joined: Nov Tue 15, 2011 11:19 pm
Posts: 442
Location: Woolwich Twp (Swedesboro), NJ
There are some very small tube caps. They look like small electrolytics with clear shrink tube around them, but are clearly not because the values are too small.

What type of caps are these, and do they need to be replaced for a recap? Values are small, like .0047uf, but no voltage rating on the Sams.

I can post a pic if necessary.


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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: Sep Thu 12, 2019 12:42 am 
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Joined: Nov Tue 15, 2011 11:19 pm
Posts: 442
Location: Woolwich Twp (Swedesboro), NJ
Here is a pic:

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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: Sep Thu 12, 2019 2:20 am 
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Joined: May Thu 14, 2015 4:15 pm
Posts: 1792
Location: Dallas, TX
Those are polystyrene capacitors. Very stable, however they can be damaged easily by soldering heat.
They are made only of polystyrene film and metal foil, the plastic film is melted a bit to seal the cap.
Polystyrene has a low melting point so if the cap gets too hot the cap can short.

_________________
Tim
It's not the Destination, It's the Journey.


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 Post subject: Re: Nordmende chassis 1-613 Cap identifcation
PostPosted: Sep Thu 12, 2019 2:30 am 
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Joined: Nov Tue 15, 2011 11:19 pm
Posts: 442
Location: Woolwich Twp (Swedesboro), NJ
Thanks. I will leave them alone.


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