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Ofcourse your comments are valid, MOT's are optimized for their specific
task. IMHO the drawback is found in the 2000 turns HV winding, where the
copper wire is substituted for an aluminium wire (with the same diameter).
So resistance and heat becomes an issue. When used as PSU for a TC, it's
likely that the current (and losses) will be much higher and should be
taken in consideration.

I'm aware that pole pigs have aluminium windings, but the comparison
between a MOT and a Pig seems a bit crooked to me (though I would love to
see a Pig powered microwave oven in action ;)  Retail and industrial design
specs are worlds apart.

Here's a nice youtube video which shows the fabrication process of a pole
transformer. Here you can see the aluminium sheet winding as Steve

> Why?  As long as the thing is designed to carry the current and have
> acceptable losses, it really doesn't matter what the windings are made of.
> A bigger problem is that MOTs are exceedingly cost sensitive designs and
> they don't spend a penny more on materials than they absolutely have to.
> Aluminum wire is just part of it.  A pain, sometimes, because you can't
> solder to it easily, unlike copper.
>> Hi,
>>> I agree with Dave.
>>> MOT's nowadays have become very small and are all wound with aluminium
>>> wire.
>>> Even under oil these will burn out eventually.
> WHy?  Not because they're aluminum windings (pole transformers have had
> aluminum windings for decades).  Maybe because they're cheaply built?
>  If you're going to buy second hand mircrowave ovens, look for the old
>>> ones.
>>> The older the better. Old style MOT's are bigger and wound with copper
>>> wire. And these are easier to disassemble if you want to remove the
>>> shunts.
> that's generically true of everything.. older, less efficient and less
> "optimized" anything is usually easier to dismantle or modify.
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