What do you need to know? Old stuff? I upgraded a system recently from a 330 c-cor system(modified, rather unsuccesfully) to 400 mHz. The old c-cor was unstable. When the regulated power supply aged, it created AC ripple that threw of the AGC. Chassis ground issues, external test ports made sweeping rough. Gotta say, I love the 550 SA gear, even if it is all fresh kill.
This is CABL.com posting #101115. Tiny Link: cabl.co/mAs3