[Arran]

This isn't unusual, most TV shops don't want to deal with an old radio even if they know how to service it, it's just too much trouble and many are afraid that they will get stuck with it when they present the bill. With the phono cartridge you may have some troubles finding a factory style replacement, many of those old cartridges used something called "Rochelle Salt" crystal pickups, on occasion they used magnetic ones. In either case the original cartridge will likely need to be rebuilt or another one adapted in it's place to work. It's only a 78 RPM record changer anyhow, it can be made to work but your music selection is somewhat limited.
Regards
Arran