Same thing happens with the Oberheim xpander. Late 3372's won't work in certain ones, (vac leakage, etc) but will in others. Early versions work fine in all. Try to find a chip with the same suffix as the others in your synth. Ie cem3372-01 and check date code. Hope this helps...

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From: John Leimseider john.leimseider@... [chromapolaris] <chromapolaris@yahoogroups.com>;
To: chromapolaris@yahoogroups.com <chromapolaris@yahoogroups.com>;
Subject: [chromapolaris] Re: Problem with CEM3372 Circuit
Sent: Wed, Oct 8, 2014 2:53:45 PM

The different versions of the CEM3372 have some subtle changes. On some synths, like the Prophet 600, there needed to be a resistor change so the later version would oscillate the same... It was recommended to not mix them. On the OB Xpander, there was a free warranty update from version B to version C because of distortion on the VCA. Almost all the Polaris's I've worked on were version B. I have a couple of tubes of the version B's that I got from Fender when they dumped all the Chroma and Polaris parts. I don't find the version B to be a problem, but if you mix B and C, there is definitely an audible difference. Also, between the version A and B. Sent from my iPad

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