There is a famous book, to give you an idea of the sophistication, the "US Navy Handbook of Preferred Circuits": https://usermanual.wiki/Collections/Help-Docs/

There is a famous book, to give you an idea of the sophistication, the "US Navy Handbook of Preferred Circuits": https://usermanual.wiki/Collections/Help-Docs/books/www.rsp-italy.it/_contents/Us%20Navy%201955-60%20Handbook%20of%20Preferred%20Circuits.pdf.html https://usermanual.wiki/Collections/Help-Docs/books/www.rsp-... There is a vacuum tube circuit called a "Phantastron"- a triggered voltage to time converter, you could do this with a 555 timer today... (or um, in 1972..). https://www.radartutorial.eu/17.bauteile/bt52.en.html https://www.radartutorial.eu/17.bauteile/bt52.en.html Here, in a three tube oscilloscope: http://www.hanssummers.com/tinyscope/tinyscopek3imw.html http://www.hanssummers.com/tinyscope/tinyscopek3imw.html