Re: MOT vs. 0pen-frame transformer

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Tim J by way of Terry Fritz <twftesla-at-qwest-dot-net>" <digital_raven45-at-hotmail-dot-com>

Going MOT secondary to MOT secondary is just fine.

I'm not sure what sort of MOT's you have, as some have the secondaries very 
close to the core and can not take anything more than 2.4 kV without 
flashing over. The MOT's which I am familiar with are wide spaced secondary 
to core types made for "1980's style 600-900 watt Sanyo/ Kenmore microwaves 
which can withstand serious abuse at 6 kV. They also deliever 625-700 mA 
when shorted.

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If you want voltages above 6 kV...have 2 MOT's case grounded and run the 
outputs into the next transformers, and so on. I run 2 pairs
(4 MOT's) in series for 9600 VAC which delievers 6000 VA into my
new Tesla Coil system. I've been able to get a minimum of 8 ft arc, and a 
maximum of just under 12 ft arc with a MONSTER TOPLOAD. But beyond this, 
your going to need to use your "modified" MOT's which were suggested...(by 
cutting of MOT secondary to core lead). This way you can go over
6 kV without thinking about insulation failer...but their is one catch: if 
you are using this power supply on a Telsa Coil you MUST use transformer oil 
to protect against RF kickback. Right now I have a 3 pair (6 MOT's) running 
14400 VAC/8000 VA which REALLY pounds out some BIG sparks. I can get 14 ft 
arc on a Telsa Coil!