Re: MOT mod.

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

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

Put one or a couple turns through the core and hook up a volt meter, apply
power and measure it.  You'll get a volts/turn number, and then you'll be
able to calculate the output.  You might want to give yourself a few taps to
allow adjusting for the "under load voltage" when you get the tube hooked
up.

It's not going to be very many turns (I'd guess around a volt per turn)

As for current output, it is what it is.. limited mostly by heating of the
transformer. Use the biggest wire you can fit in the hole in the core.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, January 16, 2004 8:15 PM
Subject: MOT mod.


 > Original poster: "Christopher 'CajunCoiler' Mayeux" <cajuncoiler-at-cox-dot-net>
 >
 >
 > In an attempt to throw together a tube style TC, I have
 > determined (mainly by the state of my finances) that I
 > will need to modify an old MOT to supply the 5 volts
 > that the tubes use.  After about an hour of work, and a
 > massive quantity of frustration, I was able to fully
 > remove the secondary winding, and the original filament
 > winding, leaving the MOT's primary and shunts unscathed.  Now I need to
know
 > how many turns of wire to insert into
 > the MOT core to get the voltage and sufficient amperage to
 > run the tubes.
 >
 > The tubes are a pair of 4-125A (Sylvania) radial beam
 > power tetrodes, wired in triode mode.  The specs say the
 > filaments require 5 volts -at- 6.5 amps.
 >
 > I'm sure with the huge collective of experience there is
 > in this list, someone must have a pretty good idea of
 > what I need to do to get the job done.
 >
 > Help!
 > ---
 > C.L. Mayeux
 > Owner, MSB Data Systems
 > http://www.msbdatasystems-dot-com
 >
 >