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 Post subject: Raleigh Sound Master High Sensitivity All Transistor radio
PostPosted: Nov Tue 14, 2017 10:44 pm 
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Joined: Jun Sat 25, 2016 6:36 pm
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Attachment:
Raleigh Sound Master.jpg
Raleigh Sound Master.jpg [ 23.6 KiB | Viewed 341 times ]

Hi friends,
Please help with some information on a Raleigh Sound Master High Sensitivity All Transistor radio from 1965 (or so). It needs some parts to be replaced, including the two resistors pictured. We can't tell the value of these resistors because they've been burned to powder. There is no color coding on them to provide information. The information was printed on them, but is now unreadable. Please help by either 1) sharing a schematic for this radio or a source to get one or 2) looking at your schematic or if you own one of these radios, looking at the actual radio and report back to me what are the values of these two resistors.

As always, thank you very very much for any assistance you can provide!
Diane
P.S. Yes, we understand the need to find out what burned these in the first place. Full repair/restoration is in progress, if only we can find out the values of these resistors. Thanks again!
Attachment:
Sound Master resistor.jpg
Sound Master resistor.jpg [ 59.42 KiB | Viewed 341 times ]


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 12:49 am 
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Joined: May Wed 01, 2013 10:05 pm
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Location: Rayleigh, BC, CANADA
That radio comes in several flavors, Goldstar, Nobility, Marlin, Sound Master, does the badge on the rear say BM 709 ?

Looks like your circuit board has a little different layout. I'm not surprised.

The resistor that blew could be the 220 ohm tied to one of the output transistors which I suspect has blown (shorted) that's a good place to start.

We've discussed this radio a few times in the past, here's the most recent with schematics.

http://antiqueradios.com/forums/viewtop ... 4&t=312837

Keep us posted on what you find, we can help you troubleshoot this.

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Rocco


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 12:59 am 
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Joined: Jun Sat 25, 2016 6:36 pm
Posts: 86
The only thing on the back is a sticker that says "Made in Korea" and the R logo sticker. From what I can ascertain is that the model IS "Sound Master High Sensitivity All Transistor". The front says all of this. I either don't know how to go to the old forum, but I don't see any schematic on the link talking about the Nobility. I will take your answer to the technician and I will follow up shortly.

THANK YOU!


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 1:05 am 
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Joined: Jun Sat 25, 2016 6:36 pm
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220 ohm is a good place to start. I also forgot that there's another resistor that is blown. On the picture I sent with the original post, it's the tan-ish resistor just under the wide part of the arrow just above the yellow wire. Any ideas on the value of that one also?????????

Thanks again!
Diane


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 1:30 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4955
Location: Indianapolis, IN
It would probably be a good idea to replace the electrolytic capacitors, also---notice the blue one in lower left, the shrink label has split meaning that it may be shorted and has overheated maybe causing that resistor to burn. Appears to be in power supply line...

Good luck !

John


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 1:31 am 
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Location: Rayleigh, BC, CANADA
Good point John, glad you mentioned that, were posting at the same time again, LOL

Diane just click on the link I posted in my previous reply, it should take you to the other thread.

The other possible blown resistor could be the 680 ohm.

This diagram may not be readable due to file size restrictions of this forum.


Attachments:
GOLDSTAR SCHEMATIC (Custom).jpg
GOLDSTAR SCHEMATIC (Custom).jpg [ 42.63 KiB | Viewed 319 times ]

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Rocco


Last edited by Rocco53 on Nov Wed 15, 2017 1:39 am, edited 1 time in total.
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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 1:38 am 
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Attachment:
Sound Master resistor X2.jpg
Sound Master resistor X2.jpg [ 63.01 KiB | Viewed 318 times ]

Nutzz. I did find that schematic eventually in the previous post, but it is different enough in the model that it doesn't answer the question. So far. Yes, thank you--he noticed the electrolytic and it'll all be replaced when we figure out the value of these resistors. I'm attaching a new photo that points to BOTH places that there is an unreadable capacitor. Keep the ideas coming, please!! (This appears to be a Sound Master variety. The picture from Radio Museum that was in the original post is the same model we're working on.)

Thanks again!
Diane


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 1:50 am 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Your radio appears to be different.
Note: the five electrolytic capacitors (shown with + & -) above in Rocco's schematic are all rated at 10V

Here is a doodle pad as a starting point if you want to draw your own schematic!
Image
Large: http://a4.pbase.com/o9/56/215056/1/1649 ... titled.png

:) Greg.


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 1:57 am 
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Location: Rayleigh, BC, CANADA
Thanks for posting that Greg, much better.

Yes, this radio looks to be a different layout.

Here's the diagram with the resistors in question


Attachments:
BM-709  schem (Custom).jpg
BM-709 schem (Custom).jpg [ 52.1 KiB | Viewed 317 times ]

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Rocco


Last edited by Rocco53 on Nov Wed 15, 2017 1:59 am, edited 1 time in total.
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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 1:59 am 
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Joined: Jun Sat 25, 2016 6:36 pm
Posts: 86
There is a transformer on the speaker on the Sound Master, so this is one thing that's causing some head scratching. Help??
Diane


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 2:02 am 
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Location: Mountains of Mourne. Ireland.
Sometimes small schematics are pasted underneath the top of the cabinet.

Greg


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 2:04 am 
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Location: Rayleigh, BC, CANADA
if it has an output transformer then it's a totally different circuit, I have no info on that.

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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 2:24 am 
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Location: Mountains of Mourne. Ireland.
Out of curiosity... can you post a photo of the whole circuit board?
Image file restrictions here are width-800px by height-800px and file size-256Kb max

Greg.


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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 5:40 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4955
Location: Indianapolis, IN
Looks like germanium transistors in her set---the others mentioned were all "Super Silicon", I believe... And Raleigh did have their badge on one of those, too...

John


Attachments:
ARF KITCO INS DN.jpg
ARF KITCO INS DN.jpg [ 125.1 KiB | Viewed 290 times ]
ARF Raleigh Super-Silicon.jpg
ARF Raleigh Super-Silicon.jpg [ 197.18 KiB | Viewed 290 times ]
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 Post subject: Re: Raleigh Sound Master High Sensitivity All Transistor rad
PostPosted: Nov Wed 15, 2017 5:45 pm 
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Joined: Jun Sat 25, 2016 6:36 pm
Posts: 86
Attachment:
Raleigh Sound Master circuits smaller.jpg
Raleigh Sound Master circuits smaller.jpg [ 160.82 KiB | Viewed 247 times ]


Thanks for the responses. Please keep 'em coming--we haven't solved the mystery quite yet.

One difference between ours and all the others posted so far is that there's a transformer between the audio output and the speaker, possibly a push-pull transformer. Maybe this is the difference between the "Sound Master" and the "Super Silicon" models????

As requested, here is a picture of the whole thing.

Thanks a million!
Diane


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