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 Post subject: Zenith ch 6H02 question
PostPosted: Jun Wed 19, 2019 3:54 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 366
Location: Worcester ma, usa
I'm working on a Zenith H664 and recapping the 6H02 chassis . Should I use a safety cap when replacing C4 ,its 0.05uf @200v wax cap . The schematic is in Riders 22-13 if you can't see my scan .
Image
thanks


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Wed 19, 2019 4:24 pm 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 5724
Location: Near Brandon, Iowa
Yes, it should be a "safety" cap. Justradios.com has a good writeup on how to select them.


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Wed 19, 2019 4:34 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 9805
Location: Mountains of Mourne. Ireland.
Sams Photofact service manuals...
viewtopic.php?p=2840111#p2840111

Greg.


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Wed 19, 2019 5:28 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 366
Location: Worcester ma, usa
thanks guys , I have read that just radios article , very good .


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Wed 19, 2019 10:41 pm 
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Joined: Jan Tue 16, 2007 7:02 am
Posts: 3128
Location: Lexington, KY USA
That radio has a number of capacitors that might be replaced with "safety" caps.

I'm looking at a copy of the Rider schematic from NA. You can read the component designations on this scan. (Note that Sams use different designations.)

Besides 0.05uF C4, which should be a Class Y cap, we see 0.01uF C8, which should be a Class X cap.

But there's more! Connected to the phono jack, 100pF C17, and trimmer C18, can also connect you to the AC line. 100pF Class Y caps are easy to find. For C18, your best bet is to connect a much larger Class Y cap in series between the jack and the trimmer. 0.001uF is probably large enough. 0.01uF would be OK, too.

Even with the "safety" caps, this unit can be a shock hazard. Be sure that any backs, covers, and all knobs are in place.

This is not the unit to use on your swimming dock, or by the bathtub.

Ted


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Thu 20, 2019 12:14 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 366
Location: Worcester ma, usa
I forgot about C8 and didn't know about C18 thank you . The only expose metal on this radio is the record holding arm ,its a big hunk of Bakelite.


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Thu 20, 2019 4:11 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 366
Location: Worcester ma, usa
Between the phono jack and trimmer I could use any value between .001uf - .01uf ? I have some .0047uf X1Y2 caps .


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Thu 20, 2019 10:30 pm 
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Joined: Jan Tue 16, 2007 7:02 am
Posts: 3128
Location: Lexington, KY USA
Any fixed capacitance in series with the trimmer should be much larger than the maximum trimmer capacitance to avoid reducing the effect of adjusting the trimmer.

Also, a larger capacitance value will reduce how much the tempco of the fixed capacitor matters.

I'm not sure how much adding such a capacitor would actually help decrease the chances of having a shock hazard.

Ted


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 Post subject: Re: Zenith ch 6H02 question
PostPosted: Jun Thu 20, 2019 11:13 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 366
Location: Worcester ma, usa
Thanks Ted , I'll leave that as is and replace the 100p cap when my order comes in . The original 100p cap is rated 500v ,that could have been the safety cap of its day .


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