https://qsotoday.libsyn.com/webpage/episode-086-grayson-evans-ta2zge
QSO Today Podcast - Interviews with the leaders in amateur radio: Episode 086 Grayson Evans TA2ZGE
If you wanted to homebrew QRP radios with vacuum tubes, or thermatrons, then the goto guy would be Grayson Evans, TA2ZGE, author of the book, Hollow State...