[AMRadio] Tube Theremin


Jim Isbell, W5JAI jim.isbell at gmail.com
Thu Mar 26 23:17:23 EDT 2009


Thats a great idea as I was wondering about it also

On Thu, Mar 26, 2009 at 9:02 PM,  <sbjohnston at aol.com> wrote:
>
> Ken, that sounds great.  We could also post it online for others.
>
> Thanks...
>
> Steve WD8DAS
>
> sbjohnston at aol.com
> http://www.wd8das.net/
> ---------------------------------------------------------
> Radio is your best entertainment value.
> ---------------------------------------------------------
>
>
> -----Original Message-----
> From: Ken Zuercher <hepcatrevival at yahoo.com>
> To: Discussion of AM Radio in the Amateur Service
> <amradio at mailman.qth.net>
> Sent: Thu, 26 Mar 2009 8:36 pm
> Subject: Re: [AMRadio] Tube Theremin
>
>
>
>
> Steve,
> I have a manual for what I believe is the first commercially available
> Theremin
> made by RCA in the 1930's. It uses the same hetrodyning principal but
> uses some
> oddball transformers that would give us fits to replicate. I can try to
> scan the
> manual with schematic if you're interested. It is fascinating.
> Ken Zuercher KC8QO
>
>
> --- On Fri, 3/20/09, sbjohnston at aol.com <sbjohnston at aol.com> wrote:
>
>> From: sbjohnston at aol.com <sbjohnston at aol.com>
>> Subject: [AMRadio] Tube Theremin
>> To: amradio at mailman.qth.net
>> Date: Friday, March 20, 2009, 4:08 PM
>> I've got a new sort-of AM project on the bench here
>> now:? a tube Theremin.? This musical instrument produces
>> sound by heterodyning two
>> oscillators that run in the low-end of the broadcast band.
>> I'd like to find three Miller 70-OSC coils or
>> equivalent for this rig - anyone have some??
>>
>>
>>
>> If you are interested in the circuit, I'm building upon
>> the ideas of Doug Forbes that I found online.?
>>
>> See
>>
>> http://www.wd8das.net/theremin.gif
>>
>> and
>>
>> http://www.wd8das.net/theremin.txt
>>
>>
>>
>> Thanks...
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Steve WD8DAS
>>
>>
>>
>> sbjohnston at aol.com
>>
>> http://www.wd8das.net/
>>
>> ---------------------------------------------------------
>>
>> Radio is your best entertainment value.
>>
>> ---------------------------------------------------------
>>
>>
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-- 
Jim Isbell
"If you are not living on the edge, well then,
you are just taking up too much space."


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