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 Post subject: GE 7-2881A/B/C Service Manual Needed
PostPosted: Feb Thu 20, 2020 9:46 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 108
Location: Great Salt Lake Valley
Hi,
Searching for a reasonably priced Service Manual for GE Radio model # 7-2881A, 7-2881B, and/or 7-2881C. These are usually referred to as the "SupeRadio Cub" model. I've found a couple of sources online, but they are a little expensive for a radio I picked up for $8 at Goodwill. One was $30 for a 6 pg. download and the other was for an OEM manual from Sams Photofact for $18. I was about to purchase the Sams when in checkout I discovered it would cost another $14 for copying and shipping charges.

This radio (7-2881A) is working, but I would like to have the manual if possible to do an alignment. The AM is strong, but the FM drifts pretty badly depending on the day. It is in the basement, but the other one I have works fine (7-2881C).

Any help would be appreciated!

PCB photo attached


Attachments:
File comment: GE 7-2881A PCB
IMG_2427.JPG
IMG_2427.JPG [ 651.34 KiB | Viewed 461 times ]

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 Post subject: Re: GE 7-2881A/B/C Service Manual Needed
PostPosted: Feb Fri 21, 2020 3:38 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 108
Location: Great Salt Lake Valley
This radio (7-2881C) is listed at Radio Museum, but no schematics.

https://www.radiomuseum.org/r/general_el_7_2881c.html

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 Post subject: Re: GE 7-2881A/B/C Service Manual Needed
PostPosted: Feb Fri 21, 2020 4:55 pm 
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Joined: May Wed 22, 2013 6:58 pm
Posts: 21
Location: Cincinnati, Ohio
In the absence of the SM you can always go by the IC's d/s and the typical
application circuit in it. I am sure this is the case with your radio.
The IC that GE used is no doubt TDA1083 (the real p# is concealed).
There are plenty of this IC d/s on the net: from Telefunken, Temic, Atmel.
Maybe your problem is associated with pin 8 related and aging parts?

http://theradioboard.com/rb/viewtopic.p ... 102#p70102


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 Post subject: Re: GE 7-2881A/B/C Service Manual Needed
PostPosted: Feb Fri 21, 2020 5:52 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 108
Location: Great Salt Lake Valley
Yes, that's probably what I will wind up doing. Although this radio is considerably different than the Superadios with no AFC switch for one thing. It does appear to use the TDA1083 ic. But from the d/s pin 16 is listed as AFC bypass with a 100uF cap.... so maybe time to replace some 40 year old electrolytic caps!

It really would be nice to flush out a s/m and schematic as these radios are very good performers.

The only other problem with these that I have seen are dirty AM/FM switches which are a bear to clean. Latched to the off switch and semi-sealed.

Thanks,

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 Post subject: Re: GE 7-2881A/B/C Service Manual Needed
PostPosted: Feb Fri 21, 2020 6:21 pm 
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Joined: May Wed 22, 2013 6:58 pm
Posts: 21
Location: Cincinnati, Ohio
Oops, sorry, I did mean AFC at pin 16.


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