[sdiy] 60s organ sound

[Antti Pitkämäki]

Hi!

I tried to post this once but then my Net access crashed and I lost the 
original message, so I have to type this again and because of that I'm 
making this a bit shorter...

There are some stuff I did not notice mentioned about sixties combo organs:

-The two classic combo organs, Farfisa Compact and Vox Continental don't 
produce square waves. Farfisas produce 1:2 pulse waves (I believe) for their 
footages. They also have a feature called "booster", which makes invidual 
voices or footages sort of distort, it sounds a bit like fuzz which doesn't 
mess chords. Vox produces sawtooth waves for their footages (again: I 
believe) and also some softer waves. One of the reasons these organs have 
that cool psychedelic sound is that they avoid square waves.

-I have a tube-based Philips Philicorda organ (broken, anybody have a broken 
Philicorda they don't need? I need some parts for the organ's keyboard), 
which uses neon lamps as dividers. The resultant waveform for each of the 
three footages is a sawtooth.

BTW, somebody claimed that dividers can only produce square waves, because 
it is "the only binaric (?) waveform", but somebody else claimed that it is 
possible to make pulse wave dividers and they can be made from the same 
amount of parts as square wave dividers... Does anybody have any information 
on this? I suppose square waves can be converted to other waveforms, but is 
this the only way to get pulse and sawtooth waveforms from a divider-based 
instrument? At least I think that the tube Philicorda organ might make 
sawtooth waves directly from its dividers. There's some information on this 
site about this, but it's in German:
http://home.t-online.de/home/pam.nickel/bb/7500.htm

Antti Pitkämäki

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