[AMRadio] Tube Theremin


sbjohnston at aol.com sbjohnston at aol.com
Thu Mar 26 23:02:24 EDT 2009


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.
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-----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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