Yes I am going to be very sarcastic here. I'm so tired of seeing misinformation here on YT in general, but yesterday I saw a Hamster's video showing people how to use an MOT to power their tube filaments. He then tells people how MOT's run hot and you need a Power Factor Correction Capacitor and a Fan to keep the transformer cool. What a Dummy, even with all that Goonie Goohoo BS, the transformer is still going to draw tons of power and overheat and burn up. And on top of that, draw an extra 9/10/or more amps!
What I show here is a quick and sloppy example of how to put more windings on the primary and have the transformer operate cool, quiet, and efficiently.
Every MOTransformer will be different, but all very similar. They are not designed to run anything other than wide open throttle. The Primary is under-wound and in addition the entire core and secondary is designed for wide open throttle full magnetic core saturation at all times. You will need to add about 33% more windings to the primary to make these transformers work with other projects. In most cases that means adding 40-50 more primary windings. I am not going to go into full details here about how to know the exact number of turns, but you can get pretty close just by testing the amp draw on the primary after every 10-15 winds. Remember to use "magnet wire" of the same gauge as the original primary and add the winding in the same direction as the original primary. First test amp draw with the original primary, then after about every 10-15 turns test again, the amp draw will get down pretty low as you approach 40-50 turns, if it starts going back up you passed the sweet spot. Cover sharp edges, don't scrape the coating off or you will have to start over.
For the secondary, it depends on what you want to do, use an appropriate size/gauge of magnet wire or some high temp wire, again, the secondary depends what you need. The secondary side will be about 1 volt per turn, again, every MOT will be a little different.
For this video, I just used some scrap wire to demonstrate. Do not use regular old scrap wire like me in this video. Use the correct stuff!
In this video, this MOT started off using over 10 amps even with no load, after adding 40+ turns to the primary, it now barely uses 1 amp. I didn't count the exact number of turns and really didn't add quite enough. It was just where I got to when I ran out of wire LOL.
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