The inside of a 1950s AM radio. A closer view of the main circuit board. All four tubes are now visible.
https://files.mastodon.online/media_attachments/files/113/856/184/084/294/673/original/f4a6c41e6e19217e.png
Ok, I had to open it. The radio license sticker says 9 April 1951, but it isn't readable on the photo.
The radio has four tubes, and I'm pretty sure the four devices on a row on the left are the rectifier diodes. (Edit: nope, they're adjustable capacitors.)
It also seems to have 110V mode. 😊
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