A “Quadraline” quadraphonic. AC motor! Built like a tank. Weird, though- I don’t see a rectifier or anything that remotely resembles one. Loaded with electrolytics. Can’t find any documentation anywhere- no service manual, no user manual, no mention in any vintage equipment sites. Orphan product?
Those are Special Caps Mark. They cannot be removed, altered, or replaced. They are specifically designed to get you to upgrade to the Cassette format. They were ahead of their time...