[sdiy] Analog polyphony question

[Dr Strangelove]

Yea, the dividers don't use any ICs, they're some sort of two transistor 
circuit with some componants dependant upon which note is being divided and 
which division it is.  The oscillators are coil and capacitors oscs so there 
aren't ICs there either.  Did IC technology even exist when the continental 
organ was in production?

Does anyone know if any organs were ever made that had an LC oscillator per 
key?

Yea, and I'll make my organ with clear keys that light up when you press 
them, and I'll anodize it bright white.  :-)

         -=<Jonathan Pratt>=-
       (Phdinfunk at hotmail.com)




>From: Glen <mclilith at ezwv.com>
>To: Dr Strangelove <phdinfunk at hotmail.com>
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Analog polyphony question
>Date: Tue, 14 Aug 2001 02:55:13 -0400
>
>
>
>Dr Strangelove wrote:
>
> > Actually I had said that the Vox Jaguar does something different.  I 
>meant
> > the Vox Continental (hmm, this sounds like some sort of suspicious
> > backpeddling to save face).  It uses high frequency Hartley Oscillators
> > (Signal tapped from a split inductance in a resonant circuit), and a 
>strange
> > sort of divider circuit to derive the lower octaves.  The wierd thing 
>about
> > it is that I think it outputs something besides square waves, The Jaguar
> > sounds like square waves though.....  Kinda like a beefed up thomas 
>organ
> > but with a vox vibrato.  I've heard both of them, in, errrr, samples 
>I've
> > tracked with  :-).
>
>I happen to have a Vox Super-Continental. I can definitely confirm that 
>this
>particular model has 12 high frequency oscillators, and uses divider 
>circuitry
>to generate the lower pitches from those 12 reference pitches. I  can't 
>verify
>the type of divider circuitry, except that I don't believe there are IC's 
>in
>this organ. I also can't verify what types of waveforms are generated, at 
>least
>not from memory.
>
>However, I can confirm that this model has both "bright" and "dark" 
>drawbars
>(refers to tonal properties, not appearance.) Also, don't forget that this 
>organ
>has "mixture" drawbars - something that a Hammond didn't have. These will
>definitely not be producing a simple square wave with each note played, 
>although
>they might indeed be derived from square waves, for all I know.
>
>I'm not at home, so I don't have access to the organ at this moment. If 
>anyone
>seems interested, I'll try and confirm more details about the circuitry in 
>a day
>or two.
>
>As for Thomas organs, which model are you referring to? Thomas made a *lot* 
>of
>different organs, and there was a wide variety of sound qualities and 
>circuit
>designs represented during their history.
>
>
>Later,
>Glen
>


_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp