There are a lot of videos on the web.  The one very recent and some very old.

And then there are the few which tells us about things from the past.

 

Post your video / link that you find unique.

 

I will start with this; an attempt to re-create the Edison-effect lamp.

Termionic emission, by accident encountered when Edison was trying to find the best way to fix the filament.

He found out that electrons jumped to the filament holder.

And the tube was 'born'.

 

 

This is one reason why these are not good as the tests are unknown in most places

 

 

 

 

 

An excellent starting point for those interested in electronics design and Manufacture is Big Clive he has an interesting and varied channel including working on the Edinburgh Tattoo 

 

here is one example, there are hundreds more

 

 

 

 

 

 

 

Art, from the beginning to the end.

 

 

* Quick 'checkup' of the internals.

* Restoring the potted thing, which was a kind of an transformer.

* The making of a diy horn.

This time another item from the parts box; an tosti machine which has failed.

 

It is pretty new, no scratched and the three teflon sets are still unused.

I I went on and opened the thing to look what could be possibly wrong with it.

Measured all the connection and everything was ok, also the cord has all three wires and earth is connected to all iron parts.

 

Only one thing wasn't working. The thermostat.   In this particular device it is an KSD301 which trips and autoresets on 155 C.

 

Will replace that and to follow the theme of this thread, I've found a youtube video which shows the KSD 301 thermostat as well another one which need to be reset'd manually, the 90PM1.

 

The autoreset one are mostly found in your microwaves, ovens, pumps while the manual reset you can find in your shower water heater.

 

 

The first 5 minutes is informative, showing what they both do and how they work.

After 5 minutes the tear down begins for who want to see the insides.