Re: Alternative MOT Configuration

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

Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>

How much plate current are we talkin here?  Also, what voltage is the plate 
rated?  If you need say 500ma or more, you may have a problem that the 
primaries are in series, therefor limiting the current with the now 2x 
impedance.  I may be wrong on this though.  You may be better off using a 
parallel set of MOTs with a large variac to control the voltage.  Again, 
what are some of the tube ratings?  You may be able to push them above 
their ratings a bit.  Most people push a 3300V 833A to about 5000v.  I have 
pushed 811A tubes up to about 2500v, they are rated 2000v max, more often 
1500v!
So you may in fact be able to use the MOTS as they are intended.  I could 
not imagine using tubes that cant handle about 2kv from a MOT, and being 
all that successful at making big sparks(but thats not always the objective).
But again, i may be wrong.  Good luck.

Steve Ward.






>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Alternative MOT Configuration
>Date: Wed, 08 Jan 2003 18:24:50 -0700
>
>Original poster: "Matthew Smith by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>
>
>Hi All
>
>I think we're now all pretty comfortable with multiple MOT units.
>
>Looking at the specs for some valves (as I was brought up to say - vacuum 
>tubes to everyone else ;-) that I might be able to lay my hands on for 
>VTTC use, I found that they had a relatively low plate voltage - lower 
>than the output of a single MOT.
>
>Has anyone had any experience, or can they comment on, wiring MOTs with 
>series primaries and parallel secondaries?  Matching isn't a problem 
>because I've got several identical model pairs floating (if that's the 
>word for something that heavy!) around.
>
>Having not plugged one into my newly acquired 110V (I'm in 240V 50Hz land) 
>transformer, I'm uncertain as to how they would behave on less than half 
>the designed primary voltage.
>
>If this arrangement works OK, I should be able to feed multiple valves 
>with all the plate current I'd ever need...
>
>Cheers
>
>M
>
>--
>Matthew Smith            | Business: http://www.kbc-dot-net.au
>IT Consultant            | PGP Key:  http://gpg.mss.cx
>Kadina, South Australia  | * Tivis Project * Community Connect *