Time circuits set to 3 seconds in the future!

I got this AEG time relay from my friend and decided to show its interesting build and principle of operation. It uses a 150V voltage regulator (probably 0A2) and an unknown type thyratron (may be 5823), and interesting latching circuit on the main relay.

A thyratron is a gas-filled triggered tube which starts conducting after applying voltage to its ignition pin, and will keep concucting until the plate voltage drops below a certain threshold, in practice until power is disconnected. It's a glass-and-metal cousin of a SCR (semi-conductor relay) a.k.a. thyristor. Even the name is related.

0:00 Intro 1:10 Mysterious Device 2:20 Tubes 5:06 Teardown 6:20 Schematic and Principle of Operation 11:35 Fireup 14:23 Measurements 17:00 Afterword

I changed the thumbnail font BTW. Wondering how it affects the views, haha!

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