Re: 4-MOT supply, questions for Mike S.

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

Original poster: "Steve Lawson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <slawson-at-basec-dot-net>

Dear Mike:
         Nice job with your 4- MOT powered TC.  I admire your engineering
layout of your PC boards too.   I have a few questions I wondered if you
could answer.
1.  In your website your mention that you're using 2 MOT's on the primary
side for ballasting.  First, do thy heat up sufficiently to warrant
submerging them in oil?   Secondly,  are you using any PFC caps wired in
parallel with the 2 MOT's which I'm assuming are in series with their
secondaries shorted? (correct me if I'm wrong).
2.  Your website also says that you're using 51uF MOT caps per secondary leg
for secondary side ballasting.   I'm confused about this rather large
capacitance because most MOT caps are approximately 1 uF with a  2000 volt
rating.   How many caps are you using and how are they wired together;
Series or Parallel within each leg?
           Any input will be helpful in allowing our coiling group to give
MOT'S a try in a safe manner too.  It looks like you've taken all the right
safety precautions while building your power supply.

Sincerely,
Steve Lawson (Coiling in South Dakota)



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, December 07, 2002 11:20 PM
Subject: 4-MOT supply---Oh, my, my


 > Original poster: "Michael Strube by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <mjstrube-at-earthlink-dot-net>
 >
 > Hi Folks,
 >
 > At the end of last summer, my first light experience came to an abrupt
 > end with the demise of my 12/60 NST. Having heard so many endorsements
 > for MOT based supplies, especially their hardiness, I decided to give
 > that a try. I recently completed construction of a 4-MOT supply and
 > fired it up for the first time this week. You can plant me right on top
 > of that MOT bandwagon. The results (using 81.8nF MMC, 3.875 primary
 > turns, trigger gap, and some ballasting---see full details at
 > http://home.earthlink-dot-net/~mjstrube/tesla.html) were spectacular. I
 > routinely run this thing for 15-20 minutes continuously (wearing a mask
 > to hold off the ozone) with great performance throughout. I have to keep
 > the input to about 90 V or so or the streamers hit the ceiling too
 > often. Should be fun to fire it up outside at full tilt. This thing has
 > far outstripped the expectations I had. My remaining NST will surely be
 > gathering some dust. I've taken a few pictures of the construction of
 > the supply as well as some pictures of the coil in action using the
 > supply. They appear on the website.
 >
 > Cheers,
 >
 > Mike
 >