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 Post subject: Sears Silvertone 132-31001 AC Transistor Radio from 1968
PostPosted: May Mon 16, 2022 10:14 pm 
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Location: Lewis & Clark Stomping Grounds, Oregon, USA
A very unusual Sears Silvertone (57H 8022) AC - powered AM/FM Stereophonic Transistor Radio.

Well, I saved this one from the landfill. It was quite dirty and dusty when I got it but it cleaned up well. I opened up the back to inspect the chassis before attempting to power it up and was met with lots of dust and spider webs! Cleaned up the chassis and hit the variable capacitor with some compressed air. Lubricated all the dial string pulleys and some DeOxit on the v. cap rotor brushes.

This radio is close to impossible to service! With service, I mean the basic stuff like replacing electrolytic capacitors, cleaning switches and potentiometers. Very odd layout. When the back cover comes off, the solder/trace side of a large vertical PCB faces you. Components are only visible if you remove chassis. With chassis out, you find 4-5 individual small PCB's soldered horizontally to the large vertical PCB. These smaller PCB's are jam packed with components (transistors, resistors, capacitors, diodes, etc.) and several tabs go through slots on the main board and are soldered. Also, many wires running to these smaller PCBs. The larger components like transformers and coils are on the main board. In order to re-cap the many E.C's, each small PCB would need to come off the main board and multiple wires removed. To top it off, all of the pots for volume, treble, bass, balance & band switch are not accessible to inject DeOxit.....each pot is mounted on a small PCB that blocks access.

This radio would be a radio repairman's worst nightmare. Probably one of the most labor intensive restoration projects I've seen for a simple re-cap. I figured if it works well, job done. If not, well I guess back to the final destination - landfill.

Slowly powered up a a variac and it came to life. A little scratchy on the volume pot when adjusting volume but otherwise sounds great with no issues. It has a unique dial light that backlights the dial with a "blue glow" - similar to a car instrument dashboard light at night. It isn't a lamp, but a rectangular plate that is white in appearance when radio is off (possibly glass?). It has AM-STEREO-FM indicator lamps, FM AFC, tuned RF, bass, treble & balance. Two 4 X 6 oval speakers and option for external speakers. 16 transistors and an IC (somewhere on the PCB ?) Unusual size - 22.25" X 9.3" X 4.75"

Very little info on this one. Found some info on Radiomuseum and in the 1968/69 Sears Catalog. Model is "57H 8022". Might be manufactured by Warwick for Sears Silvertone brand. I would love to see a schematic on this but I have found nothing. Possibly no schematic out there.

Anyone familiar with this radio? Any leads on finding a schematic?

UPDATE: Radio Model "57H 8022" as shown in 1968-1969 Sears Roebuck Catalog has the chassis # 132.31001. Manufacturer of this radio for Sears was Arvin (132).

Jeff


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Last edited by 1N770 on May Wed 25, 2022 2:16 am, edited 2 times in total.
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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Mon 16, 2022 11:06 pm 
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I doesn't have a three digit mfgr code?? If Warwick, 99.9% there would be a schematic & mfgr code... In late '60s Warwick, plus Arvin, Sanyo & Toshiba were major electronic suppliers.

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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Mon 16, 2022 11:28 pm 
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35Z5 wrote:
I doesn't have a three digit mfgr code?? If Warwick, 99.9% there would be a schematic & mfgr code... In late '60s Warwick, plus Arvin, Sanyo & Toshiba were major electronic suppliers.


There is nothing on or in this radio that documents anything. Maybe there was a paper label glued on the bottom that fell off over the years. The cabinet is made of wood (particle board) and plastic. Particle board expands a little in humid conditions and I can see a paper label not sticking well to it.

I got "57H 8022" from the description in the 1968 & 1969 Sears catalog. I see no three number manufacturer's code anywhere. From what I have researched, the likely manufacturer is Warwick or Arvin.

Most of the electrolytic capacitors are Japanese-made "ELNA" brand along with Hitachi germanium transistors. Maybe a Japanese provider but I think even US manufacturers were using Japanese parts by the late 60's.

Jeff


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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Tue 17, 2022 1:01 am 
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Look on the right bottom rear. Below and left of the AC plug and right of the Sears name.

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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Tue 17, 2022 1:21 am 
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Ed in SoDak wrote:
Look on the right bottom rear. Below and left of the AC plug and right of the Sears name.


Yes. I probably should have mentioned it but I saw no connection to a valid manufacture code or model #.

The number located left of AC cord and right of Sears name is: 2002892

Still confused. There were too many secret codes in the Sears Roebuck empire, lol.

Jeff


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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Tue 17, 2022 2:16 pm 
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In addition to labels on cabinet, they were affixed to chassis as well.

Methode was Warwick's supplier for PCB, EIA code(720 I believe)often etched on the boards. They have a distinct look, early GE also used Methode boards. AFAIK Arvin built their own boards.

Methode boards.

viewtopic.php?f=4&t=346815

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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Tue 17, 2022 3:53 pm 
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Thanks Tom!

I will look at the PCB's for any clues. Interesting that the Methode Corporation stills exists today and produces products for the automotive, industrial and medical industries. Company history on their website states that they were pioneers (1951) in printed circuit technology. (www.methode.com)

Jeff


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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Tue 17, 2022 10:35 pm 
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Okay! I did some digging around the chassis and found a tiny little metal tag with a chassis # (132.31001).

This radio is a Silvertone Model 8022 CH 132.31001.
Sam's Photofact dated 8-68, Set 972, Folder 8

Still not sure who made this radio for Sears Roebuck, unless that information shows up in the Sam's Photofact. Transistors,
electrolytic capacitors and many other components are Japanese branded.

See photos of PCB and some numbers on PCB and speaker. I think some are inspection stamps but see the metal embossed "W" or possibly "M" that also has JAPAN stamped on the same part. The "W" appears to be a company logo - looking like a waveform. Maybe the numbers on the PCB, metal plate supporting tuning capacitor and speaker may reveal manufacturer. No other letters, numbers or logos appear anywhere else. Everything I found is shown in photos.

Thanks in advance for anyone who can provide more info.

Jeff


Attachments:
File comment: Main PCB view upon opening back.
Chassis1.JPG
Chassis1.JPG [ 943.21 KiB | Viewed 342 times ]
File comment: Front side of chassis.
Chassi2.JPG
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File comment: Small metal tab with chassis #
Chassis3.JPG
Chassis3.JPG [ 578.36 KiB | Viewed 342 times ]
File comment: Metal bracket support for v. capacitor w/ "W" or "M"??
Chassis4.JPG
Chassis4.JPG [ 791.27 KiB | Viewed 342 times ]
File comment: Number on main PCB
Chassis5.JPG
Chassis5.JPG [ 830.38 KiB | Viewed 342 times ]
File comment: Numbers on speakers
Chassis6.JPG
Chassis6.JPG [ 912.26 KiB | Viewed 342 times ]
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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Tue 17, 2022 11:46 pm 
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132, its Arvin.

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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Wed 18, 2022 12:51 am 
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35Z5 wrote:
132, its Arvin.


Yes! 132 - Noblitt-Sparks (pre-1950), Arvin (post-1950). Thanks Tom.

Kind of ridiculous that the chassis # is found on a tiny aluminum tab requiring chassis removal from cabinet and a magnifying glass!
Radio working very well so won't fix what isn't broken. Yet.......

Jeff


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 Post subject: Re: Sears Silvertone 57H 8022 AC Transistor Radio from 1968
PostPosted: May Thu 19, 2022 4:14 pm 
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Both Arvin & Warwick used the small metal tags.

Here's a 1962 Silvertone 2206 built bt Arvin, uses the round finger size 9v battery(pictured with AA).


Attachments:
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20220519_105121.jpg
20220519_105121.jpg [ 1.59 MiB | Viewed 284 times ]

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