Hi everybody
I just got this stereo polychorus included in a lot of old pedals, it's the big box reissue (MN3008 bbd chip)
it works but someone clearly messed up with the internal trimpots, with the feedback control past half way it starts oscillating and with certain settings of the width control there is clock noise
I am kindly asking if anybody has the original calibration procedure, I’ve looked everywhere but cannot find it
Thank you
Electro Harmonix Polychours calibration procedure
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sadrew
- Breadboard Brother
I have found the factory schematic for the MN3008 / MN3009 circuit
On the schematic there is also information on how to set the clock trimmer, which in fact is different from the older version
On the schematic there is also information on how to set the clock trimmer, which in fact is different from the older version
- Attachments
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aapolychorus.pdf- (44.29 KiB) Downloaded 100 times
