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Matrix-12 resurrecting...

Matrix-12 resurrecting...

2010-01-13 by mursupeppe

Hi, 

I've experienced a miracle. A good friend of mine, Mr. Mikko Köykkä, has managed to literally resurrect a Matrix-12 that was sold to me a while ago. Every oscillator and filter now works and the synth is actually very playable - and a very big THANK YOU comes out to this group, to all its members, the nice fellow who sold a CEM 3374 to me - and especially The Oberheim Aficionado, Karl. Without his help I would have been, well, **cked. 

For a while I thought this day would never come, but "dees dings do 'appen".

There is a minor issue left, though. After switching the Matrix on, it's actually very unstable and becomes tunable only after 15-20 minutes. Before that, some of the RES/VCF tunings will fail randomly (OSCs and everything else are tuning every time flawlessly, without hitch), until its warmed. Is there anything I could do to heal this symptom or do I just have to take it as such? The pitchbend and modwheel are also producing quite impressive wobbling and are somewhat unusable, so we'll have to dig into those as well, but they're priority 104, so to speak ;-)

Also, what type of screws and screwplates are being used in the side panels, the black ones? I've tried to find suitable parts, but unfortunately all my sources seem to have run dry. And if one of you has spare keys, I could use a few, d, g and e namely. :-D

Incredible. For a short while I thought I'd scrap the whole thing and sell its parts. Now it's returning back to work after a total internal makeover. Yes, miracles do happen.

Re: [xpantastic] Matrix-12 resurrecting...

2010-01-14 by Karl Schmeer

Hey there,
>--- On Wed, 1/13/10, mursupeppe wrote:
>From: mursupeppe
>Subject: [xpantastic] Matrix-12 resurrecting...
>To: xpantastic@yahoogroups.com
>Date: Wednesday, January 13, 2010, 12:46 AM
>I've experienced a miracle. A good friend of mine, Mr. Mikko Köykkä, has managed to >literally resurrect a Matrix-12 that was sold to me a while ago. Every oscillator and filter
>now works and the synth is actually very playable - and a very big THANK YOU comes >out to this group, to all its members, the nice fellow who sold a CEM 3374 to me - and >especially The Oberheim Aficionado, Karl. Without his help I would have been, well, >**cked.
>For a while I thought this day would never come, but "dees dings do 'appen".

Well that's fantastic. It's always great to hear that. It always amazes me, that not only is the M12/expander a technical marvel, but also a beautifully sounding, musical instrument.
>There is a minor issue left, though. After switching the Matrix on, it's actually very >unstable and becomes tunable only after 15-20 minutes. Before that, some of the >RES/VCF tunings will fail randomly (OSCs and everything else are tuning every time >flawlessly, without hitch), until its warmed. Is there anything I could do to heal this >symptom or do I just have to take it as such?
This is typical of most analog synths. However, did you recap the entire voice board/s ?
some of the filter coupling caps could be about to fail. If all have been replaced,
there could still be a cold solder joint somewhere. I would reflow the solder around all the filter circuits.
>The pitchbend and modwheel are also producing quite impressive wobbling and are >somewhat unusable, so we'll have to dig into those as well, but they're priority 104, so to >speak ;-)
Sounds like the set screw that holds the paddle to the potentiometer is slipping. You have to take the whole pitch bend assembly apart, to get to the shaft of the pitch bend potentiometer. If you look closely you will see whare the set screw on the paddle has worn a grove into the potentiometer shaft. If you file this flat with
a small file you can now put the paddle back on and tighten the set screw. The paddle should stay in place now. If you need more detail on this please ask.
btw I have had to do this with a few matrix 6- keyboards as well.
>Also, what type of screws and screwplates are being used in the side panels, the black >ones? I've tried to find suitable parts, but unfortunately all my sources seem to have run >dry. And if one of you has spare keys, I could use a few, d, g and e namely. :-D
Don't know on the screws but I know a guy with a trashed ;matrix 6 keyboard ( same keyboard as M12) I will see if he wants to sell em. They are NOT BRAND NEW,
but will work.

>Incredible. For a short while I thought I'd scrap the whole thing and sell its parts. Now it's >returning back to work after a total internal makeover. Yes, miracles do happen.
Man, I love to hear that.
: - )))))))))))))))))))))))))))))))))
Karl Schmeer

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