I got this one off of shopgoodwill for a reasonable price and it was quite grungy but worked with no hum.
The picture above has the contrast out of whack as it was not as dirty as it looks.
It had all its original tubes inside, all marked SEC Hitachi.
Under the chassis there is not much that needs to be replaced. The square metallic box under the large green capacitor near the volume pot is the rectifier in an unusual mount.
All of these Japanese AM/FM radios I have worked on have similar circuits and the same filter caps.
I removed the chassis, and the speaker to give it a good bath with simple green.
The things I don't like about them are that the plastic often shrinks and or cracks around the screw holes, they suffer from SMD, and the dial covers or face plates are melted in place.