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 Post subject: Help IDing a 1970s Magnavox Console
PostPosted: Oct Mon 11, 2021 2:56 am 
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Joined: Oct Mon 11, 2021 2:09 am
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Found this at a local thrift store for $15. Having a heck of a time finding info on it. The model tag is missing and I haven't been able to find another unit using Google image search. The right side audio is very very weak. I already tested the speakers by swapping wires between them. My hope was to use this to learn a bit more, instead of blindly recapping, unless that's the best option regardless. Thanks :D

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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Mon 11, 2021 3:44 pm 
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Joined: Dec Mon 23, 2019 5:52 pm
Posts: 618
Magnavox is one of the few makers where a model number really does no good when searching for service information. They go by chassis numbers. Look for a small trading stamp size sticker with the letter "R" on it followed by some numbers somewhere on the chassis, or, a rubber stamped number on the metal part.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Tue 12, 2021 1:35 am 
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Joined: Mar Tue 30, 2010 2:24 am
Posts: 9139
Location: Lehighton, PA.
1971 model 3768, in French Provincial, antique ivory. Rated at 50 watts power with 2 high compliance 10" bass woofers and 2 1,000Hz exponential horns. Yours has the optional 8-track tape player.

The 1973 model 3844 is identical except it has a built in 4 channel decoder. So whether or not yours has the 4 channel decoder will determine the model.

You might try cleaning the controls with DeOxit for the weak audio problem.

Larry

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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Tue 12, 2021 1:49 am 
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Thank you both for the information. It has a 2 channel/4 channel switch located near the record player. Does this mean it has the decoder?


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Tue 12, 2021 2:14 am 
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Joined: Oct Mon 11, 2021 2:09 am
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More pictures to help ID the radio. I would like to find/buy a schematic so I can confirm the correct cap values. Thanks again.

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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Tue 12, 2021 3:31 am 
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Location: Lehighton, PA.
JunkForLess wrote:
Thank you both for the information. It has a 2 channel/4 channel switch located near the record player. Does this mean it has the decoder?

Yes.

Larry

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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Tue 12, 2021 9:03 am 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Service data for chassis R-231-xx-xx was published in Sams Photofact (pretty pictures) service manual Set-1361 Folder-4
ref: https://www.samswebsite.com/en/photofac ... sid/1361_4

If you send arf member Hotwax a PM (private message) active at the bottom of any of his postings, and ask politely, he may send you a copy... :)
viewtopic.php?f=9&t=398861


Greg.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Tue 12, 2021 6:44 pm 
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Joined: Oct Mon 11, 2021 2:09 am
Posts: 8
egg wrote:
Service data for chassis R-231-xx-xx was published in Sams Photofact (pretty pictures) service manual Set-1361 Folder-4
ref: https://www.samswebsite.com/en/photofac ... sid/1361_4

If you send arf member Hotwax a PM (private message) active at the bottom of any of his postings, and ask politely, he may send you a copy... :)
viewtopic.php?f=9&t=398861


Greg.



So I have a R23113DE but the SAMs link provided only goes up to R23113DA, Does this matter?

Thanks!


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Wed 13, 2021 12:28 pm 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
It is the same chassis.
As little as one or two component changes (or different values) can trigger a revision / (DE) ←suffix change.

It fact, you may have trouble spotting the difference between...
R-231-13-DA and R-231-13-DE
Also, there is every possibility that Sams' index was not updated for the later variations in the production-run (life) of a model.

Hotwax is one of the good guys around here.


Greg.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Wed 13, 2021 12:55 pm 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
If you goof-up or need parts. lol
there is a chassis on eBay
https://www.ebay.com/itm/393622236280

Image
Large: https://i.ebayimg.com/images/g/Hw0AAOSw ... -l1600.jpg

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Large: https://i.ebayimg.com/images/g/xHgAAOSw ... -l1600.jpg

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Large: https://i.ebayimg.com/images/g/t-EAAOSw ... -l1600.jpg

Image
Large: https://i.ebayimg.com/images/g/m5IAAOSw ... -l1600.jpg

Greg.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Wed 13, 2021 7:29 pm 
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Joined: Oct Mon 11, 2021 2:09 am
Posts: 8
I have not worked on radios before. Should I not replace the caps in the tuner section? Would that require I have the alignment adjusted or something?

The volume issue happens in FM-Stereo, Aux and Phono. My plan was to start with the amp section. If the right channel clears up I would move onto the PSU.

For caps, I have used Panasonics in other projects. Any recommendations for this amp and psu?

Thanks.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Thu 14, 2021 12:31 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 18293
Location: Mountains of Mourne. Ireland.
Your first step would be to obtain the service literature.

Can you read a schematic and identify components?

Are you mechanically minded?
What have you worked on before?
What is your background and experience?
Can you solder?
What tools do you own?
Do you own a multi-meter - - - and more importantly, do you know how to use it?

Maybe you have a skilled buddy who could assist you.

Just disconnecting all the leads and getting the individual chassis' onto the bench needs to be done carefully and methodically, marking-up all leads and connections with masking-tape flags. A to A, B to B et cetera.


An example (repair) of what lies ahead.
Magnavox Console No Audio
viewtopic.php?f=6&t=338391

I'm not trying to put you off, you will get assistance here if you think that you can handle it (take it on)... :)
Greg.
oh... you don't have to answer all of the questions. lol


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Thu 14, 2021 4:18 am 
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Joined: Oct Mon 11, 2021 2:09 am
Posts: 8
The short answer is Yes, I am ready to work through it. Also, this one has two multi-pin plugs for all the wires, so I get off easy there. I haven't heard back from HotWax about the SAMS and I don't wish to keep bugging the nice guy. I'll buy one off the SAMS site tomorrow and have a look.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Thu 14, 2021 6:19 am 
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Location: Mountains of Mourne. Ireland.
ten-four... :)


I wouldn't purchase Photofact Set-1361 Folder-4 from the publisher, it will be a low-resolution pdf for 22 Bucks!

Photofacts come in Sets→ (large envelope) with a number of Folders inside.

Originals of your Complete Set-1361 can be found on eBay for $10.00 shipped from Vegas.
It may be eight, ten or 12 pages.
https://www.ebay.com/itm/183895188839

You can if you wish, check with the seller that Folder-4 is included before you pull the trigger.
Greg.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Thu 14, 2021 2:40 pm 
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Joined: Aug Sun 23, 2015 6:01 pm
Posts: 1278
Location: NJ 08090
Quote:
I wouldn't purchase Photofact Set-1361 Folder-4 from the publisher, it will be a low-resolution pdf for 22 Bucks!

Greg is correct....I've purchased a few from Sam's only because there was no other choice...and the resolution was terrible for the $$$.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Thu 14, 2021 6:32 pm 
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Joined: Oct Mon 11, 2021 2:09 am
Posts: 8
Nice!, I was trying to search ebay for this stuff but it kept showing me CB radio stuff. I contacted the seller about set 1361.

Thanks.


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 Post subject: Re: Help IDing a 1970s Magnavox Console
PostPosted: Oct Fri 15, 2021 11:42 pm 
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Joined: Oct Mon 11, 2021 2:09 am
Posts: 8
SAMS is on the way. I sprayed down the pots, but no change with the weak right channel. I measured the voltage from ground to the metal shell of the transistors. One in each channel shows 46.5 volts, but the other two show 0. Does that seem odd?


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