https://www.righto.com/2018/09/glowing-mercury-thyratrons-inside-1940s.html?showComment=1536374518144
Glowing mercury thyratrons: inside a 1940s Teletype switching power supply
We recently started restoring a Teletype Model 19, a Navy communication system introduced in the 1940s. 14 This Teletype was powered by a b...
switching powerglowingmercurythyratronsinside