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 Post subject: 1920s homebrew Superhet portables
PostPosted: Aug Tue 13, 2019 11:11 pm 
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Anyone wish to post any homebrew superhet portables? Thinking of building a smaller version of the one I'm building.

The ones I'd like to see are they type where someone made an attempt to make a set as compact as possible. The one I'm building now is based on a Popular Mechanics model, and it's enormous.

Also, Dale Davenport had a copy of the March 1925 Popular Mechanics issue--it had the second installment of their 8 tube superhet. If anyone could post that as well, I'd like to see it.

Bill


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 Post subject: Re: 1920s homebrew Superhet portables
PostPosted: Aug Wed 14, 2019 12:03 pm 
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Location: Dayton Ohio
Not exactly portable, but its a compact homebrew superhet from the 1920s. :D

It was built into a Radiola RC radio cabinet.

-Steve

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 Post subject: Re: 1920s homebrew Superhet portables
PostPosted: Aug Wed 14, 2019 6:44 pm 
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Very interesting set. UV-199's date to 1924-1925. The Radiola RC was 1922-23. Why would someone gut a 1923 radio to use the cabinet in 1925?


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 Post subject: Re: 1920s homebrew Superhet portables
PostPosted: Aug Wed 14, 2019 7:20 pm 
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Location: Sanford Fla 32771
azenithnut, very cool and interesting radio, but can you point out the IF transformers, and what frequency is the IF. And are they adjustable ?.

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 Post subject: Re: 1920s homebrew Superhet portables
PostPosted: Aug Wed 14, 2019 8:19 pm 
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JBL_1 I can't really say. It is possible the RC was damaged in some way. Front panel busted? Lightning damage? Who knows!

Paul, the IF transformers are the four objects in the bottom photo with four thumbscrews on each one.
They are Remler 600 such as seen in this link. No they aren't adjustable.

http://www.duanesradios.info/html/remle ... rmers.html

The Karas Harmonix units are the two audio interstage transformers.

On topside you can see the oscillator coil in the center and I believe it was designed to be used with a loop antenna or some other external antenna coil.

-Steve

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 Post subject: Re: 1920s homebrew Superhet portables
PostPosted: Aug Wed 14, 2019 8:24 pm 
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azenithnut wrote:
On topside you can see the oscillator coil in the center

Is that a Silver Marshall coil? Looks like a couple in my Silver Marshall SG-440.

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 Post subject: Re: 1920s homebrew Superhet portables
PostPosted: Aug Wed 14, 2019 8:32 pm 
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Sure is! :D I like how it unplugs!

I found the receipt inside I bought it on April 24, 1993 from Fair Radio Sales in Lima Ohio for $45
I was rather excited to find it piled under a bunch of junk. All tubes were missing and the panel meter was missing.
I found a panel meter for it, but tubing it up never happened.

I still need to trace out the circuit.

-Steve

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


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 Post subject: Re: 1920s homebrew Superhet portables
PostPosted: Aug Thu 15, 2019 12:21 am 
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Thanks Steve, I have done a couple of TRF and several Superhets of the late 1930s with typical if tuning cans, but now I will be looking for an early suprhet. The link you gave helps a lot understanding the very early superhets. http://www.duanesradios.info/index.html

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