This is a nice vintage Crown IC-150 Preamp.
The IC-150 preamp is missing the "turn-on" relay, so there will be a "pop" sound on poweup if the power amp is turned on prior to the preamp. This is a very common issue on these preamps and does not present a problem as long as the preamp is turned on prior to the power amp. It is also missing one of the silver stickers on one of the pushbutton covers (cosmetics only).
The original owner's manual is included.