via here
"There are 6 CEM 3372s used in the Prophet, one for each voice. Greg Montalbano [analogsynthservice] needed to replace two of the 3372s on his Prophet and discovered that the two new chips had a "radically different response to filter CVs" than the other 3372s. He then confirmed that the chips were working correctly and even added "a trim pot to add -5 volt offset to the filter CV, and that brought the new filters somwhat in line with the others." It was not until he purchased other 3372s that he was able to match the the original CEMs in his Prophet 600.
Greg writes that the 'bad' 3372s, 'have the manufacturing code ending in 'A-01.' Chips with all other codes worked just fine [All other codes that Greg tried]. I'm mentioning this because the CEM3372 is crucial to the total performance of the Prophet 600; it can throw off the tuning, shut out one or more oscillators, and generally play havoc with the VCAs.'"
Thursday, September 25, 2008
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MATRIXSYNTH - EVERYTHING SYNTH
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MATRIXSYNTH - EVERYTHING SYNTH
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I had a P600 I bought off Craigslist and came across this warning about six months ago when researching the instrument and possible pitfalls. This glitchy CEM chip really will fuck your synth up. I had to sell mine for parts because it wasn't worth the cost to replace them all.
ReplyDeleteif you buy a second hand P600 and find out it's got these 01 chips your best6 bet from my experience is cut your losses and try and get a good deal for it's components. Wine Country will lowball you if you try and tell it to them, so will tone tweakers. I got almost double both their asking prices by selling it myself being very careful to mention that it's value was in the working components and not in its playabillity.
It's still a shame, forgetting the glitches the p600 was the best vintage polyphonic keyboard I've ever owned.