Hi,
Didn't find a Yahoo Group for the Chroma, but maybe there are Chroma owners here as well. I recently purchased one of the first fifty ARP/Rhodes Chroma's. Unfortunately, the batteries had been allowed to leak for some years, and there were green flakes of corrosion on the traces of several of the pc bds. Luckily I got a replacement (old) CPU bd from the bay, and the voice bds appear to be workable.
The bd that really should be replaced is the I/O pcb. One of the key switch boards also took a hit. So I am looking for someone who has some spare Chroma pieces that they would be willing to part with. If you are saving an I/O bd as a source of particular replacement parts, I would be happy to carefully remove those parts for you and send them back. Things like the slide pot, or the DAC chips, for instance, that may be hard to find.
Anyway, if you can help me, please email. Thanks,
Bob