[Prev][Next][Index][Thread]
Re: MOT - PSU
What are you using for current limiting?
> Original Poster: jkooi-at-wish-dot-net
>
> Hi Reinhard, all
>
> I'm building a TC with MOT's also, but still can't seem to fix my problem of
> blowing my 16A fuses
> When I measure it I see that it is taking 40-50Amps from my wall socket
> before blowing my fuse :-((
>
> I've got 2 MOT's (different ones, since identical ones are hard to find)
> connected the primary's of the MOT's in parallel, and the secondary's in
> series
> It doesn't matter if I switch connections of the primary, still the same.
> When I take one of either of the MOT's , it works fine, but
> together.........POW.
> Each one of the MOT's alone takes a normal 6.6Amps, and it's own limiting
> works just fine when it is on it's own.
>
>
>
>
> ----- Original Message -----
> From: "Tesla List" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Sunday, March 12, 2000 1:52 AM
> Subject: Re: MOT - PSU
>
>
>> Original Poster: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net>
>>
>> Hi Herwig,
>>
>> > Original Poster: "Herwig Roscher" <herwig.roscher-at-gmx.de>
>> > Hi fellow MOT coilers,
>> >
>> > For my new VTTC unfortunately I havn't found a
>> > suitable plate xformer yet. Therefore I'm
>> > thinking of using a couple of MOTs instead. My
>> > YU-204 tube is intended for pulse use and will
>> > require more than 2.5 kVdc I can get out of the
>> > 1.8 kVrms MOTs used in this part of the world.
>>
>> Snip.
>>
>> Try looking for bigger microwave ovens with Gardner (U.K.)
>> MOTs. These put out 2.3kV at 650mA rated (measured,
>> too). Antiparallel both on the 230V side and series the two
>> on the secondary side. Center tap the connection coming
>> from MOT #1 and going into MOT#2 and ground it. That
>> way, you will get 4.6kV-at- 650mA (making ~3kVA) without
>> overvolting the secondaries of the MOTs. These Gardner
>> MOTs are up to the job and their insulation is better than
>> most of the MOTs, I have seen. If you want to go to the
>> trouble to build a set of two (meaning 4 MOTS) isolation
>> xformers you could use 4 of these Gardner units to get
>> 9.2kVAC at 650mA (~6kVA). That should give your VTTC
>> a smokinŽ (pun intended) hot output. Actually, I have run 4
>> of these in series w/o isolation xformers and they held up
>> beautifully in air. There was no corona to be seen in the
>> dark. A 5th one in series (NOT of the Gardner type) didnŽt
>> last long, before it arced to the core (not surprising).
>> However, even then, the Gardner MOTs did NOT arc over
>> or die.
>>
>> The only problem is FINDING these brutes, but maybe
>> youŽll have more luck than I did ;o))
>>
>> Coiler greets from (and back to) Germany,
>> Reinhard
>>
>>