via this auction
"The rev 2 used the earlier SSM chips that sound to my ears so much better than the later Curtis chips. The problem with the SSM chips (and probably why they went to the Curtis chips) and more generally the rev 2 was the tuning stability. This is why bands quite often used the rev 2 in the studio but the rev 3 on tour (Talking Heads, Japan etc). This problem has been resolved in the rev2 thanks to the masterly work of James at Synth Repair Services...there are now 8 little pixies running around inside making sure the tuning is just tickety-boo (well thats what James told me)for the more technically minded, the power supply was upgraded (see toroidal photo), all presets replaced, and very high precision resistors used in DAC circuit. There is probably more to this mod but thats all I could work out from James Walker(Synth Repair Services).
I have been told that this was one of the earlier Prophet 5 rev 2's as it has a smooth panel surface, I have not been able to verify this. If anyone out there is more knowledgeable on the different rev2's it would be great if they could let me know if this is true or not."
