Multimoog bass mod

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soulstar108
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Joined: Thu Feb 09, 2012 12:10 pm

Multimoog bass mod

Post by soulstar108 » Wed Apr 16, 2014 2:58 am

Has anyone tried it ?
I've seen some controversy about this e.g. in this thread
http://www.vintagesynth.com/forum/viewt ... =5&t=68115
whereas other seem to think it's fine
http://www.emusic-diy.org/MoogManuals/MicroMoog

Cheers
Mike

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MC
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Re: Multimoog bass mod

Post by MC » Wed Apr 16, 2014 9:19 am

I am the author of that modification. It does work.

That's the first time I have seen that VSE thread. "Don T" may dispute my approach but he never admitted to using that modification.
Gear list: '04 Saturn Ion, John Deere X300 tractor, ganged set of seven reel mowers for 3 acres of lawn, herd of sheep for backup lawn mowers, two tiger cats for mouse population control Oh you meant MUSIC gear Oops I hit the 255 character limi

soulstar108
Posts: 10
Joined: Thu Feb 09, 2012 12:10 pm

Re: Multimoog bass mod

Post by soulstar108 » Wed Apr 16, 2014 10:18 am

Hey
Thanks for replying, did it "over emphasizes the square wave, leaving the other wave forms quieter. It does drive the filter nicely on a square wave, though" ?

And what do you think about this, is it valid ??
"it would make more sense to bypass C506 with a 1.0uf cap, and if the real C506 is an electrolytic or tantalum, it may not only be due for replacement, it probably had a high ESR to begin with. If it was me, I'd simply replace C506 with a good-quality 1.0uf film cap and call it a day. If a good film cap would be difficult to fit, I'd use an audio-quality 2.2uf non-polar electrolytic cap, such as the NIchicon ES Muse series."

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MC
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Re: Multimoog bass mod

Post by MC » Wed Apr 16, 2014 1:52 pm

soulstar108 wrote:Hey
Thanks for replying, did it "over emphasizes the square wave, leaving the other wave forms quieter. It does drive the filter nicely on a square wave, though" ?
Never noticed the other waveforms being quieter or the overemphasis on the square wave. Many others have done that mod and that is the first time I heard of that behavior.
And what do you think about this, is it valid ??
"it would make more sense to bypass C506 with a 1.0uf cap, and if the real C506 is an electrolytic or tantalum, it may not only be due for replacement, it probably had a high ESR to begin with. If it was me, I'd simply replace C506 with a good-quality 1.0uf film cap and call it a day. If a good film cap would be difficult to fit, I'd use an audio-quality 2.2uf non-polar electrolytic cap, such as the NIchicon ES Muse series."
I experimented with those values. My ears heard less low end with those values. Like I said, he has never admitted to using that modification.

It's not a destructive mod and very easy to reverse back to stock.

To put it quite frankly, VSE is filled with misinformation. There is a reason I do not visit that site.
Gear list: '04 Saturn Ion, John Deere X300 tractor, ganged set of seven reel mowers for 3 acres of lawn, herd of sheep for backup lawn mowers, two tiger cats for mouse population control Oh you meant MUSIC gear Oops I hit the 255 character limi

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