MOTM

Actually, the 490 resonance response is quite different from the 904A.  On 
the 904A, the oscillation is very weak and doesn't really start until you 
hit 2 o'clock or so.  It is also true that many 904A's don't even 
oscillate.  One of mine didn't until Paul "fixed" it.  I'm not quite sure 
why the response on the 490 is so touchy.  I'm going to look into the mod 
for the range too.

         Eric


At 09:01 PM 8/24/02 -0500, John Loffink wrote:

>I m sure the 940 resonance was designed to be similar to the 904a, but I 
>don t mind changing the response to something more useful.  I tested this 
>with a 100K pot and thought a 75K value gave the best range, but I don t 
>have that value in my resistor stock and didn t want to muck up the board 
>with parallel resistors.  There is some difference at maximum resonance 
>when you change R29.  The sine wave is not as pure at rez=10, instead it 
>seems to be more modulated by the input waves.  But I tend to stay at low 
>to medium resonance, so it didn t matter to me.
>
>John Loffink
>jloffink@...
>
>
>I agree... This filter sounds AMAZING. :)  I think I might do the 
>resonance range mod too. For my use, I don't think there's enough of a 
>sonic change past the halfway point in the res pot to warrant keeping it 
>this way.
>
>I can see myself ordering one or two more of these filters in the near 
>future.
>
>Andrew
>
>
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