MOT - PSU

• To: tesla-at-pupman-dot-com
• Subject: MOT - PSU
• From: "Herwig Roscher" <herwig.roscher-at-gmx.de> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sat, 11 Mar 2000 11:00:46 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

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. 
Consequently I'll have to stack the MOTs.
As one end of the secondary winding is connected 
to the core, the insulations between 
primary/core and secondary/core are poor and 
it's not possible to connect the secondary 
windings in series simply.
In order not to overstress the insulation at all 
I'm planning on using the following wiring:
(please use an equidistant font)                 
 
                                    |-E 3.6kV OUT
                          |--C- |   |
                          |     \ | \
                          |     / | / HV
                          |     \ | \
                          |     / | /            
   2 trannies             |     \ | \
   in parallel            |     | | |
	L----     ----A----x-x---------x-x--D 1.8kV
        |   |         | | |     |   |            
        / | /         / | /     |   |            
        \ | \ HV  HV  \ | \     |   R 
        / | /         / | /     |   |            
        \ | \         \ | \     |   |            
        | | |         |   |--B--x---|            
  N---- | | |         |          
          | |         |            
          | |         |           
          x-x---------x--------------- GND
          | 
         GND

The high value resistor R should define a 
certain potential for B and C in order not to 
leave it to the undefined insulation resistances 
of the xformers.

Of course this setup is intended for half wave 
service.

Will this circuit meet the requirements? I'd 
like to ask the experts for their advice.

Regards

Herwig

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