Re: Re: Convert your MOT to NST?

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

Original poster: "G by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bog-at-cinci.rr-dot-com>

Hi,
I using the classic doubler design. Two MOTs wired series opposed and 
outputs wired as so:

mot*----||---|---------- MOT ballast----to tank
|     1 uf   |
|           |<  diode
|            |
|           |<  diode
|            |
mot*----||---|---------- MOT ballast----to tank
       1 uf

My primary tank cap is 0.041 uf.

I suspect RF feedback into the transformers is causing their failure. 
I have no Terry-type filter. I do know that a LOT of rf was getting 
into the mains before I sank a dedicated ground for the line filter. 
The neighbors' alarm clock, cable box, tv, telephone, toaster, etc. 
were going haywire :). Of course I had all of my stuff unplugged. 
Proper low-impedance grounding on the line filter solved it all 
except for some tolerable tvi. I am saving some money now for 
doorknobs and MOVs to try and improve reliability.

Gregory

>Greetings Gregory
>
>Your dead MOTs in doubler arrangement is surprising to me. Couple of
>questions
>1) Are you using Two MOTs centres grounded phased to give about 4.4kv ac rms
>into the doubler or what is your PSU configuration
>
>2) What size is Cp ?
>Best
>Ted L
>----- Original Message -----
>From: Tesla list <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Sunday, January 27, 2002 5:40 AM
>Subject: Re: Re: Convert your MOT to NST?
>
>
>>  Original poster: "G by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><bog-at-cinci.rr-dot-com>
>>
>>  Hi Ted,
>>
>>  I currently use an MOT doubler supply to power my coil. I have lost
>>  about 5 MOTs to internal secondary failure. They were all run under
>>  real xfmr oil. I haven't been able to figure out why this is
>>  occurring, but I can say the output of the doubler circuit will
>>  regularly jump my 3/4" ! (or better) safety gap. I had to set it wide
>>  because the power arcs were almost constant, and each one required a
>>  power-down. I just got annoyed and set it huge. But the MOTs are
>>  trash salvage so I'm not upset :).
>>
>>  I have yet to put money into nice test equipment so I cannot shed any
>  > more light on the subject.
>  >
>  > Best,
>  >
>  > Gregory