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Multimoog bass mod
Posted: Wed Apr 16, 2014 2:58 am
by soulstar108
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
Re: Multimoog bass mod
Posted: Wed Apr 16, 2014 9:19 am
by MC
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.
Re: Multimoog bass mod
Posted: Wed Apr 16, 2014 10:18 am
by soulstar108
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."
Re: Multimoog bass mod
Posted: Wed Apr 16, 2014 1:52 pm
by MC
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.