That's on of those 45 changers isnt it? It would have a crystal cartridge that would probably be bad. If Tony's test proves the amp is working, you'll either need to replace the cartridge with something modern, or get the cartridge rebuilt. There is a guy named Syl over on
http://antiqueradios.com/forums who rebuilds crystal cartridges. No personal experience, but thats who I'd look up.
John