Michael Mc Culloch cited this old evocation of a vacuum tube experiment seemingly producing helium and neon
https://www.jstor.org/stable/pdf/1636856.pdf
QuoteOn the Appearance of Helium and Neon in Vacuum Tubes
AT the last meeting of the Chemical Society, Sir William Ramsay, Prof. Collie and Mr. Patterson described some experi ments which they regard as proving the transmutation of other elements into helium and neon. I have been making experiments of a somewhat similar character for some time, and though the investigation is not yet finished, the result I have obtained up to the present time seem to me in favor of a different explanation from that put forward at the Chemicl Society....
Phil Wilson cited this web site
http://www.levity.com/alchemy/nelson2_6.html
I'm not sure it is related to LENR as it seems hydrogen is not involved, but maybe someone can analyse the description (sadly not a paper) to see what emerge.
It remind me a later (1950s) experiment of Sternglass, which looks more like LENR as it is hydrogen filled discharge tube