need advice on starting a potential buy help!

[technicolor]

Got a lead on RCa colortrack, mid 70's. Of course it's the proverbial hasn't been used in 15 years but worked at that time

Do i just fire it up there and hope for the best? He ain't asking much, but if it shot, then i'm just getting rid of his garbage.

What's a cheap or free way safe way to start up a system that has been sitting for awhile?

I'm picking up a magnavox tomorrow that fits that bill as well.

I was wondering if leaving them in a hot dry basement that has electric heat, maybe put it close to the heater and try to dry out any moisture.

Is there some type of spray i can buy?