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 Post subject: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 3:25 am 
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Joined: Jan Thu 16, 2020 12:29 am
Posts: 172
Since my home made TRF radio was so well received (Thank you for the kind remarks about it) I thought I would post this one too.

It is a little unusual, perhaps even "odd-ball". It is a MW-SW radio composed entirely of Fetrons.

The mechanical construction is based on a steel pained Hammond chassis, the front panel is about 1/8" thick stainless steel. The wiring is teflon covered, the meters are avionics parts, the Eddystone epicyclic ball drive dial was modified with lamps & the meters added. Perhaps one of the most unusual things, it uses an industrial Telemechanique power switch (great feel) for the band change. It switches miniature Teledyne relays to do the actual band change.

I designed and built it as sort of a "tribute" to the Teledyne company, who have produced over the years many high quality and interesting products. Here is the story behind it:

http://worldphaco.com/uploads/WORLDFETRON.pdf


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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 3:35 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 37685
Location: Livermore, CA
Great job. Did you work for Teledyne? I received some Fetrons from a person who did. One of these days hope to build a project with them. Believe WE and maybe others made some Fetrons.

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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 3:43 am 
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Joined: May Thu 04, 2017 1:08 pm
Posts: 361
Location: Raleigh, NC area
Geez Louise, you do nice work...


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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 3:52 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8383
Location: Beautiful Downtown Burbank CA
You really do nice work. Keep them coming.


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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 3:52 am 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 10152
Location: Santa Rosa, CA
We thought about FETRONs at Siliconix, but wisely concluded it was not a viable commercial product.

Rich


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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 4:03 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 23566
Location: Somers, CT
Nice!!!!

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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 6:31 am 
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Joined: Jan Thu 16, 2020 12:29 am
Posts: 172
Norm Leal wrote:
Great job. Did you work for Teledyne? I received some Fetrons from a person who did. One of these days hope to build a project with them. Believe WE and maybe others made some Fetrons.


No I have never worked for Teledyne (I wish I had), I live in Australia.

However I have been very impressed with Teledyne products.

The Fetrons were interesting. A number of types were made. Including double triode equivalents that were used in the front ends of guitar amps (Mesa-Boogie) to replace 12AX7's etc. The Fetrons had no microphony and lower noise.

There are some odd things that can happen with them though, they are not really "plug in substitutes" in all cases . The input doesn't exactly behave like a tube's grid, so if you wire one up as a self grid biased oscillator it malfunctions and you end up with multiple harmonics in the output, but its easily fixed by adding an external diode & resistor.

Still, the Fetrons were a clever idea and had a really catchy name.


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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 4:18 pm 
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Joined: Dec Sun 21, 2014 6:37 am
Posts: 2067
Location: Portland, TN, USA
A real pleasure to look at.

Thanks for posting.

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 Post subject: Re: HOMEBREW FETRON RADIO
PostPosted: Jan Sat 18, 2020 4:34 pm 
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Joined: Aug Tue 28, 2018 9:22 pm
Posts: 1618
Location: Sanford Fla 32771
ACORNVALVE: Incredible work, that is museum quality work.
I was curious if ebuy had any listed, and sure enough, they did.


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