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 Post subject: Part Identification and Capacitor question
PostPosted: May Sat 11, 2019 8:21 pm 
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Joined: Mar Wed 27, 2019 1:56 am
Posts: 62
Location: League City, TX 77573
I attached 2 files, one is of a round ? and the other is a capacitor. Both are from a ROBYN T-123B Transceiver

1) what is this round thing is this a diode and if so what would replace it?
2) Can this capacitor be replaced with an Aluminum Electrolytic? What is WV and the (M)


Attachments:
File comment: what is this?
CD196FAF-3AC0-493F-B0FE-56779C831BC3.jpeg
CD196FAF-3AC0-493F-B0FE-56779C831BC3.jpeg [ 72.45 KiB | Viewed 289 times ]
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 Post subject: Re: Part Identification and Capacitor question
PostPosted: May Sat 11, 2019 8:56 pm 
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Joined: Jan Tue 16, 2007 7:02 am
Posts: 3090
Location: Lexington, KY USA
You can edit your original post to add the missing photo.

Or just "reply" to the original post, and include the photo in the reply.

It is best not to create multiple threads about the same project. The moderators may come after us...

The small blob on a wire thing is a diode.

Best to try to find documentation for your radio that specifies what it should be. If you know of information available online, it would be good to post links.

Does the blob have anything printed on it?

What are the diameters of the blob and of the lead wires. These can be matched up with old catalog information to get an idea about what the current or power rating was for the original part. I think such diodes were documented in the old GE Silver databook.

If you cannot locate any information, probably a 1A 1000V rectifier diode might be safe to use.

It would be good to try to discover why it blew-up, before replacing it and turning on the power.

Ted


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 Post subject: Re: Part Identification and Capacitor question
PostPosted: May Sat 11, 2019 9:26 pm 
Member

Joined: Mar Wed 27, 2019 1:56 am
Posts: 62
Location: League City, TX 77573
Thank you! I thought about adding to the original post after creating the second and when I went back to delete it I couldn’t find a delete post. My mistake as I never posted a pic on here. Live and learn.
The diode dint blow it looks like it broke, if I hold it on there it makes a little spark and the radio works. I checked voltage on it and it seems to be 558vdc.

I found the schematic but can’t find the diodes in it (2ea) that I can see.


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 Post subject: Re: Part Identification and Capacitor question
PostPosted: May Sat 11, 2019 10:16 pm 
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Joined: Mar Wed 27, 2019 1:56 am
Posts: 62
Location: League City, TX 77573
Found it! Thank you.


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 Post subject: Re: Part Identification and Capacitor question
PostPosted: May Sun 12, 2019 5:01 am 
Member

Joined: Jan Tue 16, 2007 7:02 am
Posts: 3090
Location: Lexington, KY USA
Some of those guys have a weld just outside the body, where the special alloy bonded to the die is welded to a softer lead wire material. Probably the weld broke.

If the voltage is that high, you may need a really HV rated part. It would help to have a look at the circuit.

Ted


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 Post subject: Re: Part Identification and Capacitor question
PostPosted: May Sun 12, 2019 8:37 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 8691
Location: Long Island
In answer to the next question, the capacitor in the picture is 0.1-uF, 600-VDC. It looks like it may be a paper in oil type. If so, it may be leaky enough at this point in time to be questionable. You will not find any electrolytics with those ratings. Determining a substitute would best be done knowing where it is in the circuit, but just about any modern polypropylene or polyester film capacitor of the same ratings should be able to handle it.

_________________
"Hell, there are no rules here--we're trying to accomplish something!"

Thomas A. Edison


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