This educational demonstration tube shows an electrical discharge in lowering air pressure. It also shows how positive and negative beams form at low gas pressures. This video is a link from http://www.tuopeek.com/vacuum_tube.html
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https://www.youtube.com/watch?v=wWXWDZk7ABc
Playing with Photo Multiplier tube here on an external supply of 900V. This tube has a large window and 11 Dynodes making it quite a sensitive. Also include a demonstration of very low energy x-rays being produced at 8.8keV. This was surprising, an acceleration voltage this low it can be found in Oscilloscopes CRTs, whereas old television CRTs use 15kV and 25kV.
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https://www.youtube.com/watch?v=VvEFUwH7-kY
Just a short video to demonstrate resonant transmission by tuning two Tesla Coils to the same frequency.
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https://www.youtube.com/watch?v=ORwkjossnbg
These large high voltage x-ray transformers not only generate very high voltages but also have high current capacity. The ratings for peak power can be in the order of x10 kW. This one, I think is, around 35kW with a potential of 150kV. Many smaller x-ray machines have the transformer and tube built into the head assembly. In this larger type, the head and PSU are housed in separate units. This video looks at the transformer and rectifying circuit. The transformer is designed to operate from an 8kHz AC supply normally driven with a half bridge inverter. For testing here, a H-bridge driver is being supplied with up to 30V 30A DC. As these transformers are designed to operate under oil and have a centre tap arrangement it can be difficult to modify them due to the likely hood of breakdown to chassis/ground.
The design has similarities to the construction of some later TV flyback HV transformers with HV stages. However, as well as being many time larger, this transformer is full-wave and the core is not gapped as in flyback construction.
CONTENT:
00:00 - Intro
00:58 - Testing
02:45 - Construction
10:20 - Modification
11:50 - Circuit diagram
12:49 - spark test
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https://www.youtube.com/watch?v=LkeYHma9hgs
Just a quick video on old crystal oscillators
These large oscillator crystals often required to be maintained at specific temperatures during operation to give the required frequency accuracy. Instruments employing these ovens needed a bit of time to reach temperature and stabilise for correct operation.
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https://www.youtube.com/watch?v=PcgU9MFwmp4
I needed to rebuild my old engine or throw the car away. This is a Land Rover V8 Efi going through it’s first start-up after a full engine rebuild. It was a messy job and took quite a while. Luckily it appears to work..
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https://www.youtube.com/watch?v=B2kUVUcbtvg
Colour Lissajous figures displayed on an old monitor CRT. Flyback transformer driven from a 12v halogen supply. Deflection coils connected to an audio amp. Some sounds supplied by nordrecordsuk.
More info at: http://tuopeek.com/lissajous.html
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https://www.youtube.com/watch?v=qr7rB5JRBuk
Here a small part of a broken fluorescent tube is placed into a larger outer tube. The outer tube has 6kV across it and the air is pumped out of the tube.
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https://www.youtube.com/watch?v=Gfe2kCY_ouQ