The other day I put this together for a bit of fun! However it is definitely not fun! :D Support These Vids plus lots of extra content :- https://www.patreon.com/lookmumnocomputer The mentioned astable multivibrator made from delay relays :- https://www.youtube.com/watch?v=ku91Yg2lJmk I'm trying to track down some NC and NO's so I can make the above circuit for a museum display too!± if you have any you are interested with parting with please get in touch and we can strike a deal! more info on the museum of everything else :- https://www.museumofeverythingelse.com/ Paypal :- https://www.paypal.me/lookmumnocomputer #electronics #vacuumtube #science