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MOTM

Index last updated: 2026-04-09 22:55 UTC

Message

Re: 490 resonance

2003-04-27 by mate_stubb

> It begins to oscillate
> around 8.5. at the low end (around 90Hz).  Is there any way to get 
> it to self-oscillate below that??  

That's a limitation of the Moog filter design. Paul worked very hard 
to keep that behavior in to maintain the authentic sound. 

> While I'm on the subject of swapping resistors.  Does anyone know a
> good way to unsolder MOTM PCB's??  They seem to delaminate very
> easily. 

The first thing you should ALWAYS do is to cut the component out. 
Clip all the legs with a sharp pair of dykes. It's not worth saving 
that component worth a few cents (worst case a few dollars) to ruin 
your board. Then it becomes much simpler to work on one pad at a 
time. I like to heat from one side and use a vacuum sucker from the 
other. Properly timed, you can heat the pad just until the solder 
liquifies again, then suck the leg out the other side.

Moe

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