Re magnetrons, there's a bit of a story behind how I acquired them. Those devices would hardly ring a bell with many electronics people, even those who recognized them as such likely wouldn't think they were important from an historical stance.
When I was a kid I used to rat old WWII surplus radio/radar gear for parts and whilst I never came across any of that first generation of magnetrons I'd seen photos of them in books on radar.
Many decades later I was helping someone move an old aircraft engineering works of WWII vintage that manufactured parts to a new location. It was not only crammed full of machine tools, lathes, milling machines, metrology equipment etc. but just about everything under the sun. For example Singer sewing machines of about 1880s vintage, uranium glass wine glasses, Arts and Crafts Movement lamp shades, oil lamps, old glasses, tons of old magazines, old chemical lab equipment and bottles of partly-used reagents, half-used cans of aircraft paint, wooden aircraft propellers from 1930s etc., etc., including dead rats were among the many thousands of different items—all piled up to the gunnels. One could hardly move and it was dangerous as one could be injured on junk, sheet metal offcuts, piles of sharp swarf and such—if you've ever seen those TV programs on hoarders you'd get the picture.
Anyway, those magnetrons were amongst literally tons of junk destined for the tip and it's just a very lucky fluke that I spotted them. I'd never seen one for real before but I instantly recognized them for what they were. It was a most fortuitous find.
The owner of the factory couldn't have cared less about them and they'd almost certainly have ended up in landfill if I hadn't spotted them. How these magnetrons originally ended up there was that his father who originally owned the factory was a compulsive auction goer and bought huge loads of military disposals at auction after the War.
