Looks like someone made this in there basement.
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very likely it was just some homemade thing in someone’s basement......not that there is anything wrong with that.
Some of my best audio finds have been well-made homebrew and occasional or "small batch" garage manufacturers. You just need to be able to inspect and evaluate circuit design and build quality. It should be a snap for anyone who ever took high school electronics shop. If you don't know what that is then never mind.