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Registered Member #62119
Joined: Sun Feb 04 2018, 04:59AM
Location: Cedar Rapids, Iowa
Posts: 136
Completed January 2018.
* Completely self-contained for portability * MOT-powered 833A * Separate variacs for plate voltage and filament voltage * 20" streamers in interrupter mode
The operational picture is with the ion engine attached to the discharge terminal producing a rotating series of streamers.
Registered Member #61923
Joined: Tue Nov 21 2017, 03:27PM
Location: NW Montana USA
Posts: 11
Very nice sir! Im not at all familiar with a MOT powered 833A. Im fairly new to coil building & am completely self taught. Ive built my own quad mot power supply so i know mots, but what exactly is the 833A part of it.
Registered Member #61890
Joined: Sun Nov 05 2017, 05:57PM
Location:
Posts: 8
E.B.C. wrote ...
Very nice sir! Im not at all familiar with a MOT powered 833A. Im fairly new to coil building & am completely self taught. Ive built my own quad mot power supply so i know mots, but what exactly is the 833A part of it.
Its a vacuumtube. Think of it as an HV-transistor. If you want to know more about such coils, just google vttc (vacuum tube tesla coil).
Registered Member #62119
Joined: Sun Feb 04 2018, 04:59AM
Location: Cedar Rapids, Iowa
Posts: 136
Thanks for the compliments. As someone previously stated, a 833A is a type of vacuum tube capable of handling about 2 KW of power. This is an older technology that preceded transistors. Look in Wikipedia under vacuum tubes. Although mostly obsolete today, they still have uses such as in high-power radio transmitters, large induction heaters and others. And of coarse some of us still like to build tesla coils with them as an interesting alternative to spark gap coils which I also build.
For tesla coil use they have some advantages over transistors. They can withstand very high voltages. A 833A can be operated reliably at 4000 volts. They are also electrically rugged and very forgiving. The disadvantages are that they are large, relatively inefficient, get hot, and are mechanically fragile. But the main reason some of use use them for tesla coils is that they are interesting to look at and a challenge to build and get running properly. Since the output is CW (continuous wave), the quality of the streamers is completely different from that of a spark gap coil.
There are some more detailed pictures of my VTTC under the "Projects" section or just use this link.
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My 833A-Based Coil
