[sdiy] Help with Hammond Solovox service info

[John Loffink]

There are several books on pre-synthesizer electronic instrument design 
that could be of interest to the general synthesizer audience, since 
they also cover synthesizer precursors such as Theremins, Ondes 
Martenot, Trautonium and the Solovox.

Electronic Musical Instruments by Richard H. Dorf (I have the second 
edition copyright 1958).  It shows instrument photos, internal assembly 
photos, partial schematics and has detailed circuit descriptions of 
these instruments.  It has a 9 page chapter on the Hammond Solovox.  
Unfortunately the chapter in my copy suffers from a "double printing" 
from wet ink on adjacent pages, so it is difficult to read.

The Electronic Musical Instrument Manual by Alan Douglas (I have the 
fifth edition from 1968).  This book has complete schematic pullouts of 
many instruments or assemblies, such as tone generators and pedal 
boards.  It also has photos of instruments and circuity assemblies.  It 
has a photo, a complete circuit schematic pullout and two page technical 
description on the Solovox.

Either of these books should be required reading for anyone designing or 
repairing tube based electronic instruments.

Aaron Lanterman wrote:
>
> On Jul 5, 2008, at 12:00 AM, Grant Richter wrote:
>
>> A Hammond Solovox that was given to me as a teenager has come back to 
>> me after 30 years in a friends basement.
>>
>> It is an all tube monophonic "kind of like a synthesizer" thing with 
>> a keyboard controlled oscillator and passive formant filters.
>
> This got me curious about old organs in general, and in some 
> goolgling, I ran across this:
>
> http://users.rcn.com/clonk/ChordOrgan/Schematics/index.html
>
> It's not the model you're looking at, but if you look at the top of 
> the schematic (listed as Figure 6 on the website), there's what 
> appears to be a "solo" section, including switches for "bass," 
> "tenor," and "soprano."
>
> Perhaps various hammond models share some similar innards? If so this 
> might be useful.
>
> - Aaron
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-- 
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com