Where did 625 line television come from?

[ppppenguin]

That's the idea.

The Tektronix 180 time mark generator uses a similar method: https://w140.com/tekwiki/wiki/180 I think the use of the term "monostable" in the description may be a little misleading. I'm fairly sure they are synchronised blocking oscillators.

[Amie]

So... The duo diodes were for pulse shaping? I didn't initially notice the transformer feedback winding in the screen grid feed of the KTZ63s...