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Old 24th Nov 2021, 7:02 pm   #1
jagnut66
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Default EKCO model PB510 Motor Tuning Contacts wanted

Hi,
I have just registered, so hope I'm posting this in the right place.
I have a 1939 EKCO model PB510 that has just been put back in working condition, insofar that I can receive MW stations by manually tuning to them.
However this radio also has eight preset positions, which are non functional, due to the auto selector connectors on the two loops inside being worn out.
Does anyone know a source of these, NOS / repro?
Pictures attached.
Many thanks in advance for any help you are able to give in location eight replacements.
Best wishes,
Mike.
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Last edited by Cobaltblue; 25th Nov 2021 at 9:25 am. Reason: Added wanted and brief description
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Old 24th Nov 2021, 7:19 pm   #2
stevehertz
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Default Re: EKCO model PB510

Sorry I can't help you but I'm sure I recall this having been done and covered previously. Fingers crossed.
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Old 24th Nov 2021, 7:21 pm   #3
Cobaltblue
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Default Re: EKCO model PB510

Hi Mike

Welcome to the forum.

This is unfortunately a common problem on these Motor tuned sets.

However the forum members are ingenious and I am sure there is a thread on this very subject.
Hopefully one of the members can point to it.
Steve beat me to it
Cheers

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Last edited by Cobaltblue; 24th Nov 2021 at 7:21 pm. Reason: Crossed with Steve
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Old 24th Nov 2021, 8:30 pm   #4
cathoderay57
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Default Re: EKCO model PB510

Here's one https://www.vintage-radio.net/forum/...d.php?t=141700 . Jerry
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Old 24th Nov 2021, 11:41 pm   #5
jagnut66
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Default Re: EKCO model PB510

Quote:
Originally Posted by cathoderay57 View Post
Thanks for that Jerry.
Unfortunately, whilst informative, giving me ideas on how to repair them, the thread itself has been closed. So I am unable to ask the previous posters for pictures of their repaired items to compair with my unrepaired ones.
If someone has some images of what these connectors are supposed to look like, with an arrow on possibly, to denote the small area that is supposed to make contact, I would be very grateful.
Best wishes,
Mike.
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Old 25th Nov 2021, 6:48 am   #6
mark_in_manc
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Default Re: EKCO model PB510

Thanks for the prod by email. I sold mine on before doing anything with it, and I think the new owner made a good one out of two - at the time I think there were various suggestions, including using the contacts out of relays to make something up.
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Last edited by mark_in_manc; 25th Nov 2021 at 6:58 am.
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Old 25th Nov 2021, 8:00 am   #7
cathoderay57
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Default Re: EKCO model PB510

Hi Mike, here are some pics of the contacts from a McMichael 802 motor-tuned set that I'm working on. The Ekco contacts are probably similar, but at least it gives you the idea. The way it works is that there are usually 4 radial insulating strips on the rotor disc surface and so the disc rotates until one of the contacts encounters the strip, which breaks the motor circuit. That means the width of the contact tip must be narrower than the insulating strip, otherwise the contact tip will override the strip and the motor will keep running. So choose your replacement contacts with care. Cheers, Jerry
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Last edited by cathoderay57; 25th Nov 2021 at 8:26 am.
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Old 25th Nov 2021, 8:36 am   #8
cathoderay57
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Default Re: EKCO model PB510

Quote:
Originally Posted by cathoderay57 View Post
That means the width of the contact tip must be narrower than the insulating strip, otherwise the contact tip will override the strip and the motor will keep running.
Having had another gander at the McMichael, that last statement isn't true. The contact moves past the insulated strip onto the next quadrant, where the switching arrangement means there is no supply, and so the circuit is broken. The contact point width therefore isn't that critical, but still aim for about 1mm or so. Cheers, Jerry
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Old 25th Nov 2021, 9:24 am   #9
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Default Re: EKCO model PB510

Quote:
Originally Posted by jagnut66 View Post
Unfortunately, whilst informative, giving me ideas on how to repair them, the thread itself has been closed. So I am unable to ask the previous posters for pictures of their repaired items to compair with my unrepaired ones.
If you click on the poster's name, you'll get a page with a 'contact info' button. Click this and one option is to send a private message to that poster.

You'll also see a 'statistics' button on the page with the contact info button, going this way will let you see when that person was last on the forum, so you can gauge whether they are still active. Many people have the forum set to send them a notification email when they get a private message.

If necessary, moderators can re-open threads

David
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Old 25th Nov 2021, 9:26 am   #10
Cobaltblue
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Default Re: EKCO model PB510 Motor Tuning Contacts wanted

Thread title updated and moved to wanted section at OP's request.

Cheers

Mike T
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Old 26th Nov 2021, 8:26 pm   #11
Laurence Smith
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Default Re: EKCO model PB510 Motor Tuning Contacts wanted

Hi Mike,

Here some pictures of one of the contacts from my PB510.

Cheers,
Laurence
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