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 Post subject: '60s Sears Silvertone Stereo Radio Phonograph Restoration
PostPosted: Apr Tue 18, 2017 10:52 pm 
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Joined: Apr Tue 18, 2017 10:41 pm
Posts: 3
Hey all! New to the forum, here. Looking forward to learning from you all.

I recently purchased a late 1960's ('68, maybe?) Sears Silvertone Stereo Radio Phonograph with the intention of restoring both the cabinet and the electrical/mechanical components. For the sake of this thread, we'll stick to the latter.

The unit comprises two 12-inch subwoofers, two 4-inch midrange speakers, and two horn tweeters. When plugging in the unit, I've got sound coming through both left and right sides, but it sounds awful. I'm thinking the speakers may be shot, but a) I'm unclear on how best to test the speaker components individually, and b) I have no idea (beyond size) what to look for in potential replacement components.

Here are the specs I do have:
Model No. - 7060 Walnut; 120 volts; 60 cycles; .9 amp; 65 watts
Radio Chassis No. - 528-63530
Amplifier Chassis No. - 528-69580
Record Changer Mech. No. - 528-66670

Any advice would be greatly appreciated!


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Apr Wed 19, 2017 12:55 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12364
Unless they've been wet or otherwise damaged, speakers are rarely the problem... Usually the speaker coupling caps are a issue in these units... Unless ALL the electrolytic caps are replaced it'll likely never play as it was designed...


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Apr Wed 19, 2017 3:47 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 1130
Location: 77001
Hello,
Here's my two bits worth:

1. Sam's Photofact reference for amp/radio chassis is # 953-7
from 1968. Schematic will contain components lists for
any replacement.
2. How much experience in vintage electronics/electronics do you have ?
3. Your sound problem may be a bad stylus or bad stereo cartridge.
Do you have a way to plug in the record changer to another amplifier
to test it ?
4. Is the sound coming out strong and the same on both sides of
the cabinet ?
5. Post photos of your console and the inside with the record changer.

Hotwax


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Apr Fri 21, 2017 3:35 am 
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Joined: Apr Tue 18, 2017 10:41 pm
Posts: 3
35Z5, thanks for that tip. I'm assuming the electrolytic capacitors will be simpler to test/replace than the speakers.

Hotwax, here's my response to your questions:
1. Didn't know about Sam's Photofact... Good resource... Thanks for the tip.
2. Minimal. Know my way around a soldering iron, but that's about it
3. At the moment, the record player isn't turning. Since the radio is picking up a signal and piping that through the speakers, I thought I'd focus on getting that sounding good before dealing with the turntable.
4. Weak, garbled sound coming out of both sides of the speakers equally, which (now that I think about it) would point more toward an issue with the amp than the speakers themselves, no?
5. I'll take some photos shortly and get them posted.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Apr Fri 21, 2017 2:51 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7238
Location: Bossier City, Louisiana
Agree with 35Z5. Speakers are rarely the problem. A full electrical restoration is in order.

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Dave

http://pages.suddenlink.net/davesradios/


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Aug Fri 04, 2017 10:29 pm 
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Joined: Apr Tue 18, 2017 10:41 pm
Posts: 3
Thank you all so much. Attached are photos that I have. Let me know your thoughts! I am ready and willing to do the research and learn the skills to fix it up, but if you could point me in the right direction, that would be great. Apologies it's so dusty, still working to clean it out.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Aug Sun 06, 2017 2:03 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7536
Location: Beaver Falls, PA. USA
Boy, it has been a long time since I worked one of those! It's 50 years old now, and as 35Z5 said, all of the electrolytic capacitors are going to need replacement; they were failing in the 1970s, when those units were relatively new.

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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Aug Sun 06, 2017 2:54 pm 
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Joined: Aug Sun 23, 2015 6:01 pm
Posts: 551
Location: South Jersey East of Philly
Seeing the SS components and PC boards here make me glad when a customer brings in a tube unit for repair.... :wink:


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Wed 08, 2017 2:26 am 
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Joined: Oct Tue 22, 2013 11:00 pm
Posts: 141
Location: Menasha, Wisconsin 54952
I have the exact same sears silvertone model 7076. My right speaker, (both internal and external not working) I sure its the amp. Chassis # 528-69580. Was anyone able to find a schematic for it. I'd really appreciate a reply.

thanks
Jeff


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Thu 09, 2017 6:42 am 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 3756
Location: Near Brandon, Iowa
muddysole wrote:
I have the exact same sears silvertone model 7076. My right speaker, (both internal and external not working) I sure its the amp. Chassis # 528-69580. Was anyone able to find a schematic for it. I'd really appreciate a reply.

thanks
Jeff

From earlier in the thread:
"1. Sam's Photofact reference for amp/radio chassis is # 953-7
from 1968. Schematic will contain components lists for
any replacement."

You can purchase and download the above data folder from samswebsite.com for $22.00.

Some larger public libraries have Sams documents available in their reference sections.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Thu 09, 2017 6:53 am 
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Joined: Feb Sun 02, 2014 1:58 pm
Posts: 910
Location: Tennessee 38058
Looks like Warrick Electronics built that unit, from the prefix "528."

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KN4GGM

"This is the last radio I will ever buy, dear; I promise"


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Thu 09, 2017 4:11 pm 
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Joined: May Sat 06, 2006 4:03 am
Posts: 2851
Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
Picture Img 3387 looks to me to have some disconnected wires. It's not clear but a lot of things these days aren't. You might need to check wiring diagram and make sure all leads are attached right.
Bill J.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Thu 09, 2017 8:30 pm 
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Joined: Oct Tue 22, 2013 11:00 pm
Posts: 141
Location: Menasha, Wisconsin 54952
Thank you lorenz200w for sams web site. Just what I needed.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Fri 10, 2017 4:12 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 112
Location: parkersburg west virginia
The two large orange capacitors on the amplifier chassis are bad. those capacitors couple the speaker to the collector of the output transistor. those were a common failure in those units. if i remember right, those were 500 - 1000 mfd @ 50 volt capacitors. replacing them will get your output working again.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Fri 10, 2017 4:52 pm 
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Joined: Oct Tue 22, 2013 11:00 pm
Posts: 141
Location: Menasha, Wisconsin 54952
Great info. Thanks. After looking at my schematics it looks like the caps are 1000nf not 1000mfd. Which means they should be 1mfd or 1uf. Does that sound right? Please let me know.

Jeff


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Fri 10, 2017 6:59 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 112
Location: parkersburg west virginia
muddysole wrote:
Great info. Thanks. After looking at my schematics it looks like the caps are 1000nf not 1000mfd. Which means they should be 1mfd or 1uf. Does that sound right? Please let me know.

Jeff


No, Jeff. apparently, that's a misprint. these are 1000 mfd electrolytic capacitors. the capacitors that i am referring to are the two large orange cardboard tubular capacitors on the topside of the amp.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Fri 10, 2017 7:19 pm 
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Joined: Oct Tue 22, 2013 11:00 pm
Posts: 141
Location: Menasha, Wisconsin 54952
Thanks, I stand corrected. The type is so small. I enlarged the print and I can see now the ratings say
1000 25V NP. At first it looked to be NF. Thanks again.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Fri 10, 2017 7:28 pm 
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Joined: May Thu 14, 2015 4:15 pm
Posts: 581
Location: Dallas, TX
NP may mean Non Polarized, which is not the usual type of electrolytic!

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Tim
"Excellent!" I cried. "Elementary," said he. - Sherlock Holmes


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Fri 10, 2017 7:51 pm 
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Joined: Oct Tue 22, 2013 11:00 pm
Posts: 141
Location: Menasha, Wisconsin 54952
So I should be able to use a regular non polarized capacitor in place of a electrolytic. I've heard from other threads on this forum that its ok to do it.


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 Post subject: Re: '60s Sears Silvertone Stereo Radio Phonograph Restoratio
PostPosted: Nov Fri 10, 2017 10:08 pm 
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Joined: Oct Tue 22, 2013 11:00 pm
Posts: 141
Location: Menasha, Wisconsin 54952
I found the problem with my sears console silvertone amp. Chassis # 528-69580. There is a burned out transistor listed as a Q6 driver, sears p/n 86-250-2. Where in the world do I find one? The values on each terminals should be:
E-6.4v
C-3v
B-5.8v
Does anyone have an idea?


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