Follow up video for the MFJ Crystal Radio kit from AmateurLogic Shorts 13. George talks a little about crystal radios, tests the set and makes some mods.
You can find the kit here:
https://mfjenterprises.com/products/vec-121k?_pos=1&_sid=f9e4f44b2&_ss=r
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Note AmateurLogic Shorts are only available on YouTube.