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 Post subject: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Sat 09, 2019 3:13 am 
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Joined: Mar Sun 11, 2007 6:55 am
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Location: Mission Viejo, southern California
The cabinet needs nothing, as it is either a good refinish or a radio which was well-cared for and kept in a good location. It was surely expensive when new and probably was in a fancy house for many years. I was delighted to get it.

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The Tenite escutcheon has some distortion, so I will have it laser scanned and the data manipulated to make a proper 3-D printed master, or even a new brown part for this and other 1938 Stromberg-Carlson models.
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I will at least replace that big black plastic-cased capacitor, add a three wire cord and add a fuse, plus better secure the large power supply filter capacitors.
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It looks very nice in a corner of our dining room, and the globe radio on top looks good (Rima's idea)
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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Sat 09, 2019 3:56 am 
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Location: Mountains of Mourne. Ireland.
Very nice Sephen.

Four pages from S-C Solder Nuggets can be downloaded from Tom Bavis' website.
Solder Nuggets 1-37 and 1-38

Also 12-pages of engineering data.
https://tinyurl.com/Made-in-Rochester

Greg.


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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Sat 09, 2019 5:07 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: SoCal, 91387
Yup, that's a beauty! Nice going, Stephen!

I don't understand though why you would alter the AC line with grounding and adding a fuse? The radio's obviously been safe as-is for umpteen decades...

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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Sat 09, 2019 5:26 am 
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Location: Mission Viejo, southern California
Thanks for the lead on the reference data!

Most of them receive better with a ground, and it improves safety. Fuses are a good safety / fire prevention measure.

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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Sat 09, 2019 8:46 pm 
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Location: Mission Viejo, southern California
I got the three wire cord and fuse installed, and replaced that one old capacitor this morning.

It works, but needs work.

The tuning belt slips, so most of each band can not be accessed. I will replace it using the Radio Daze belt kit, a nice rectangular rubber belt you cut to fit and joint the ends with a drop of super glue. I was skeptical years ago when I first saw them selling it, but have used it and it works very well. You get good traction with the flat contact surface, and you do not need to dismantle all kinds of things as is necessary with a loop belt.

It squeals badly, apparently due to a dirty volume control.

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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Sun 17, 2019 4:49 am 
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The volume control has five terminals! I was happy that Deoxit Fader Lube fixed it, as finding a replacement would be quite a challenge. Allen-Bradley is still in business, but I somehow doubt they would supply that part in 2019...

I found the tuning belt had been replaced with the Radio Daze kit, but the belt was too long, so I shortened it. I also lubricated the tuning mechanism.

The radio now works and sounds nice.

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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Sun 17, 2019 6:49 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: SoCal, 91387
Ahh Stephen old boy...Your workbench is far too uncluttered... :shock:

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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Mon 18, 2019 3:59 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: 253 Blanche St. Plymouth, MI USA
Stephen wrote "The volume control has five terminals! I was happy that Deoxit Fader Lube fixed it, as finding a replacement would be quite a challenge. Allen-Bradley is still in business, but I somehow doubt they would supply that part in 2019...

I found the tuning belt had been replaced with the Radio Daze kit, but the belt was too long, so I shortened it. I also lubricated the tuning mechanism. "

well, yes finding an Allen Bradley type J or an Ohmite type AB like you have would be tough, but tapped controls I have most anything anyone could want 1930-1970 or so. As to the tuning belt, I use a .140 round NON oiled O-ring, it works great and its even better on the motor drive sets, it wont "walk off". Just cut to snug, slip it around the "difficult" pulley and super glue. , push together and hold 30 sec, it will NEVER break, its cheap and one size works for all radios. Then you pull it over the "easy" pulley and done. Some radios would require a LOT of work to disassemble and install a continuous belt. Never understood why anyone would do that way (re: belts from Adams Mfg) or the original fabric ones ( have those too but rarely use them). I guess on some radios putting a continuous belt on is easy but not most.
Mark Oppat


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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Mon 18, 2019 4:07 am 
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Location: Dayton Ohio
I tried that years ago. I bought NAPA Buna-N O-Ring material, cut to length and super glued the ends together.

Worked great for a year, then they would break apart. Every one i ever did broke... :(

It is interesting Stromberg Carlson used the next generation Bradleyometers. I've seen the earlier square ones in their sets too.

-Steve

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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Mon 18, 2019 4:21 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5722
Location: 253 Blanche St. Plymouth, MI USA
azenithnut wrote:
I tried that years ago. I bought NAPA Buna-N O-Ring material, cut to length and super glued the ends together.

Worked great for a year, then they would break apart. Every one i ever did broke... :(

It is interesting Stromberg Carlson used the next generation Bradleyometers. I've seen the earlier square ones in their sets too.

-Steve


bad (old) glue is the problem every time I have found. I have done this for years... the only few failures were due to the "super glue" being old. At least the O-ring material I use holds forever. Could be the rubber type?
A good bond will out hold the material, you try to break it and the rubber often breaks elsewhere, not at the joint.
Mark Oppat


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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Mon 18, 2019 4:25 am 
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Location: Dayton Ohio
I can give it another try.

The rubber I used is Buna-N type as I mentioned before. The black stuff.

-Steve

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-Sparton
-Pre-War FM
Consoles and floor models, the bigger, the better!


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 Post subject: Re: FStephenMasek's 1938 Stromberg-Carlson 245R
PostPosted: Feb Mon 18, 2019 4:45 am 
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Joined: Feb Sat 10, 2018 4:58 pm
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Location: Livermore, CA
Just a crazy thought here, but would the vulcanizing "glue" that is used in bicycle tire repair kits be any good for Buna-N belts and o-rings? This "glue" forms new chemical bonds between the patch and the butyl rubber tire, and when done correctly, is stronger than the original rubber. Kinda like wood glue for rubber.

-Bryan


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