The ARRL website still has a public link to an old QST article on using a MOSFET as a high sensitivity crystal set. I have not duplicated this design, but should try it on HF. There is lots about crystal sets on my website.
See http://www.arrl.org/files/file/Technology/tis/info/pdf/culter.pdf
See https://sites.google.com/site/g3xbmqrp3/hf/crystalset
10 Mar 2020
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