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 Forum index » Discussion » Schmooze
Unknown Modular Synthetiser
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saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Sun Sep 22, 2013 4:37 pm    Post subject: Unknown Modular Synthetiser Reply with quote  Mark this post and the followings unread

Hi, here's an unknown unique modular synthetiser from the 70s (the dates on the ICs are between 1969 and 1974) :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

As you can see there are 4 VCOs, a noise generator (white, pink & red), a Ring Modulator, a Sample & Hold, an ADSR+Filter, an ADSR+VCA, an AR+VCA, a fixed multi-mode filter, a LAG Generator, an Offset Processor & a Preamp.

The legend says it was made for Jethro Tull, a J-T cover band bought it, then it spent some time in a garage, it became Brendan Pollard's property, and we bought it to a guy in France. It was brought (by B.Pollard?) to SynthRestore for a repair/update...

The circuits are made on stripboards (I'll post further photos), I ve written schematics, does someone have ideas about who's built this synth? The boards and the pots are made in U.K

The filter is a Moog ladder kind of clone..
Here is the ADSR + Filter :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The ASDR schematic :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The AR :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The VCA :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The Ring Modulator :
Posted Image, might have been reduced in size. Click Image to view fullscreen.
The schematic (AD530 based) :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The Variable LAG, Processor & Preamp :
Posted Image, might have been reduced in size. Click Image to view fullscreen.
The schematic:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Do you think the prensence of the wire between Preamp and Variable LAG is normal?

The Master circuit with a A440 generator, a reverb circuit and a headphone amp :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

And Finally The Noise generator + Sample & Hold, the Sample & Hold doesn't work but some wires are unconnected, any comments would be appreciated :
Posted Image, might have been reduced in size. Click Image to view fullscreen.


If these schematic could bring any ideas about who built this synth, where it was made etc I d be glad!
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mosc
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Joined: Jan 31, 2003
Posts: 17553
Location: Allentown, PA
Audio files: 123
G2 patch files: 60

PostPosted: Tue Sep 24, 2013 12:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for taking the time to make such a complete post. It looks like a very nice synth, especially considering it's age. It looks beautiful. I don't have a clue to the maker but maybe someone else can chime in. The schematics are very interesting.
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bubzy



Joined: Oct 27, 2010
Posts: 535
Location: United Kingdom
Audio files: 50

PostPosted: Wed Sep 25, 2013 3:05 am    Post subject: Reply with quote  Mark this post and the followings unread

how does it sound?
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saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Wed Sep 25, 2013 3:42 am    Post subject: Reply with quote  Mark this post and the followings unread

It sounds really fat, Brendan Pollard used to name it "The Beast", we called it "Elvis"...
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saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Thu Oct 17, 2013 1:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

I made a mistake on the Preamp/LAG/Processor module, here is the right schematic :
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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