Usagi Electric has a video series[1] about investigating MC14500B (with help from Ken) and recreating it on a bread board. Later this led to him developing a variation on MC14500B using vacuum tubes[2].
[1] https://www.youtube.com/watch?v=oPA8dHtf_6M&list=PLnw98JPyOb...
[2] https://www.youtube.com/watch?v=y149hLe1zYo&list=PLnw98JPyOb...