[AMRadio] Tube Theremin


Ken Zuercher hepcatrevival at yahoo.com
Thu Mar 26 21:36:06 EDT 2009


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/ 
> 
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