In my research, it seems there has only really been one change, which had to do with resistors. There were some noisy stock tubes reported for awhile, and that now seems fixed. There were also some hum problems reported with Ayre amps, but Ayre changed their grounding scheme and took care of that, I don't believe the Calypso changed anything with regards to the hum when used with Ayre. I would be interested to hear from anyone more knowledgeable on whether there were additional changes or versions, and maybe what serial number started the resistor change.
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