Yaesu included AM Modification instructions in the Maintenance Manual. Lets add the AM Mode to the FT-101. Caution Explicit Modification Content.
Top 10 Ham Transceivers of the 1970's https://youtu.be/A_JfucSmgCM
FT101 Maintenance Manual https://www.qsl.net/nw2m/FT-101_SVC_Manual.pdf