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 Post subject: Capacitor Questions
PostPosted: Feb Wed 07, 2018 4:48 pm 
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Joined: Nov Tue 08, 2016 5:59 pm
Posts: 15
Another in the series of Newbie questions brought to you by...me.

I'm working on a Hallicrafters S-38B. I've got the paper caps replaced and installed a polarized plug. It works great, but I'd like to make sure before I button it up, I've done all I can.

I've run across a few domino caps but most of them are mica so I'm not too worried about them. However, there's one type I've never seen before. The body color is a light clay color. It's attached to two high accuracy resistors. I've upload a picture for your perusal. Is this a paper cap as well? Replace?

Secondly, there's a multi-capacitor package that I'm not sure I should replace (also pictured below.) My understanding is that it's a ceramic package so might not need to be replaced. Opinions?

Thanks to you all for your kind help through the years!

Best,

Cliff


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 Post subject: Re: Capacitor Questions
PostPosted: Feb Wed 07, 2018 4:53 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9037
Location: 42001 KY
If it were me, I would leave both alone.
Your set is working.

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 Post subject: Re: Capacitor Questions
PostPosted: Feb Wed 07, 2018 6:04 pm 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Hallicrafters part number-46A151 is a four-section ceramic capacitor/s.
Known, back in the day as a... PEC (printed electronic circuit) or Couplate.
Image
C11A C11B C11C and C11D
5000pF 220pF 220pF and 2000pf

should be in the parts list... :)
Greg.


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 Post subject: Re: Capacitor Questions
PostPosted: Feb Wed 07, 2018 6:12 pm 
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Joined: Jul Mon 26, 2010 8:30 pm
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Location: Annapolis, MD
electrolytics replaced?

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 Post subject: Re: Capacitor Questions
PostPosted: Feb Wed 07, 2018 8:16 pm 
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Joined: Nov Tue 08, 2016 5:59 pm
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Yes, the electrolytics have been replaced.


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 Post subject: Re: Capacitor Questions
PostPosted: Feb Wed 07, 2018 8:18 pm 
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Joined: Nov Tue 08, 2016 5:59 pm
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Yes, the PEC is in the parts list, but should it be replaced?


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 Post subject: Re: Capacitor Questions
PostPosted: Feb Wed 07, 2018 8:28 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 656
Location: Merrick,NY,USA
I wouldn't replace the PEC couplate. Those caps are ceramic and should be fine.


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 Post subject: Re: Capacitor Questions
PostPosted: Feb Thu 08, 2018 5:26 pm 
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Location: Dallas, TX
As simplex1040 said, just leave it as it is.
If the domino cap is attached to tight tolerance resistors it is unlikely to be a paper or similar.
Since the PEC, couplate, is all capacitors it should be fine. The couplates that also contain resistors sometime have drifted resistor, I think this is because the process of manufacture is a compromise. Many times those have connection such as you can't measure all the components.

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