That Kalamazoo should be checked out by a good amp guy. The caps start to leak after about 10 to 15 years so the will need to be changed but rake it in and have it checked
The guy that died all bathe work on my amps has told me many times that guys get a great deal on a "garage sale amp" that doesn't work, then they bring it to him and he hits then with a price 150 to 250 to make it work and they flip. It's still a good deal in my eyes but some don't think so. Where else can you get can amp that's 50 to 60 years old but needs a bit of work. I don't know of anything that isn't that old that wont need done work