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Re: [TCML] MOTS



When i get back home this thanksgiving i am going to have to find that army surplus store near me.  
are there any helpful hints i should follow when designing my coil to run on 2 Mots?

-------------- Original message -------------- 
From: G Hunter <dogbrain_39560@xxxxxxxxx> 

> The HV bushings are just hardware store PVC plumbing fittings glued in place 
> with regular solvent glue. The AC power cable passed through a regular cable 
> clamp like the ones used on household breaker boxes. It's leakproof as long as 
> the can doesn't tip over. Not much danger of that due to the excessive weight 
> of the thing. The only issue I ever had was that I allowed the power cable to 
> dip down into the oil. Over time, the oil wicked up into the cable until it was 
> saturated. I didn't catch it until oil started seeping out of the plug! I 
> replaced the power cord and stripped the jacket back far enough so that it 
> didn't touch the oil. That fixed it. 
> 
> Unfortunately, this neat little PSU was sitting on my garage floor when Katrina 
> came along. It was immersed in 2 feet of muddy, salty water. I threw it away 
> in disgust, along with most of my furniture and appliances. I have some spare 
> ammo cans however, and a small collection of MOTs. Perhaps I'll build another 
> one someday. 
> 
> Greg 
> 
> 
> --- On Thu, 10/23/08, jhowson4@xxxxxxxxxxx wrote: 
> 
> > From: jhowson4@xxxxxxxxxxx 
> > Subject: Re: [TCML] MOTS 
> > To: "Tesla Coil Mailing List" 
> > Date: Thursday, October 23, 2008, 5:56 PM 
> > Those ammo cases are a really good idea. 
> > Where did you get feedthrough insulators like that and how 
> > did you seal them to the case. 
> > -------------- Original message -------------- 
> > From: G Hunter 
> > 
> > > If you wish to run two MOTs for about 4200VAC, then 
> > place the secondaries in 
> > > series with both cores grounded. Take the HV output 
> > from both MOT HV output 
> > > lugs. If you want to use 120VAC input, place your 
> > primaries in parallel, but 
> > > 180 out-of-phase. If you wish to use 240vac, then 
> > place your primaries in 
> > > series. Assuming the two MOTs are reasonably well 
> > matched, they will divide the 
> > > 240vac between them so each primary only sees 120vac. 
> > Again, make sure the 
> > > primaries are oppositely phased. 
> > > 
> > > A US military .30 caliber (7.62mm NATO) steel ammo can 
> > makes a sturdy, cheap, 
> > > oil-tight container. Pawn shops, Army surplus shops, 
> > and flea markets have 
> > > zillions of them. Two MOTs will just fit in there, so 
> > you won't need too much 
> > > oil. Worked well for me anyway: 
> > > 
> > > http://hot-streamer.com/greg/MOTDOC.htm 
> > > 
> > > and 
> > > 
> > > http://hot-streamer.com/greg/Mark_III.htm 
> > > 
> > > Cheers, 
> > > 
> > > Greg 
> > > 
> > > 
> > > --- On Wed, 10/22/08, jhowson4@xxxxxxxxxxx wrote: 
> > > 
> > > > From: jhowson4@xxxxxxxxxxx 
> > > > Subject: Re: [TCML] MOTS 
> > > > To: "Tesla Coil Mailing List" 
> > > > Date: Wednesday, October 22, 2008, 5:14 PM 
> > > > ok. I just wasn't sure if there were any 
> > benifits to 
> > > > disconnecting it from the core. 
> > > > i am assuming that to run 2 together to get about 
> > 4kv i 
> > > > should connect the cores together. giving me 2 HV 
> > outs. 
> > > > should I connect the primary's in series or 
> > parallel. i 
> > > > already know about how to match the phase by 
> > reversing a 
> > > > primary input in necessary. 
> > > > Before i do that though i have to find a way to 
> > put these 
> > > > in oil. any suggections for a container that 
> > could be 
> > > > sealed up nicely. with the help of epoxy or 
> > something else. 
> > > > 
> > > > -------------- Original message -------------- 
> > > > From: G Hunter 
> > > > 
> > > > > Should what be removed? Do you mean remove 
> > the HV 
> > > > winding, or remove the core 
> > > > > connection? 
> > > > > 
> > > > > Regardless, don't remove either one of 
> > them. Just 
> > > > leave the MOT alone and take 
> > > > > your HV off the single HV lug. This worked 
> > for the 
> > > > magnetron tube supply in the 
> > > > > oven, and it will work for you too. The 
> > return path is 
> > > > through chassis ground to 
> > > > > the MOT core. A picture is worth 1000 words, 
> > so see my 
> > > > MOT schematic: 
> > > > > 
> > > > > http://hot-streamer.com/greg/MOT_chat.htm 
> > > > > 
> > > > > No need to re-engineer your MOTs. They can 
> > drive your 
> > > > vacuum tube or tubes just 
> > > > > as they are. 
> > > > > 
> > > > > Greg 
> > > > > 
> > > > > 
> > > > > 
> > > > > --- On Wed, 10/22/08, jhowson4@xxxxxxxxxxx 
> > wrote: 
> > > > > 
> > > > > > From: jhowson4@xxxxxxxxxxx 
> > > > > > Subject: Re: [TCML] MOTS 
> > > > > > To: "Tesla Coil Mailing List" 
> > 
> > > > > > Date: Wednesday, October 22, 2008, 3:04 
> > PM 
> > > > > > ok. so leave everything alone. sounds 
> > good to me. 
> > > > 
> > > > > > What is the best way to connect 
> > everything 
> > > > together for TC 
> > > > > > use? I noticed that one of the HV 
> > windings is 
> > > > connected to 
> > > > > > the core. should that be removed. 
> > > > > > 
> > > > > > thanks, 
> > > > > > Jay Howson 
> > > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > 
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> 
> 
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