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But now I need some assistance with tweaking the filter.
Apparently this version of the Crumar has the "moog style" Filter as opposed to the later version IC filter.
My problem is that the Range on the front panel isnt wide enough, and the resonance doesnt really resonate unless its set to max and then it mostly just whistles.
The filterboard has VR´s for both the "range" and "resonance", and i tried tuning those but the the range is still limited as well as the resonance.
So ,I installed a switch that connects an additional RV to the range switch giving me 2 range settings that are then controlled by the front panel "range" fader and this accomplishes the desired range , pretty much..
BUT , now i want to get the resonance to actually resonate without being at max and hopefully without the whistling and this is where I need help.
I guess i could connect a resistor in parallel with the feedback resistor but im a noob and im not entirely sure which one it is on the schematics and im not even sure that would work.
So i need help with locating the Feedback resistor , IF in fact that could help me tweak the resonance??
Any help with making the filter come to life would be greatly appreciated.
Here´s an hand drawn schem of the filter , i do have a proper one but only on paper..
here´s a quote from Sounddoctorin .
Modifications:
I strongly recommend the addition of a 100K trim pot in paralell with the feedback limiting resistance R25 (15K) located near the filter SSM2040. The resonance is really great on these things but no self-resonance from the factory. Enjoy and careful with your speakers!!
This pertains to the SSm filter but im wonderinf if this could be applied to the Ladder Filter ?