Back in the 1990s, you could get a tape player shaped like a can of Coca Cola. [Simon the Magpie] scored one of these decks and decided to turn it into a tape echo effect instead. It didn’t work so well, but the concept is a compelling one. You can see the result in the video below.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/04/15/building-a-tape-echo-in-a-coke-can-tape-player-that-doesnt-really-work/