Re: MOT mod.

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

Original poster: "Arpit Thomas" <neko4-at-dodo-dot-com.au> 

I may well be wrong about this, but some distant race memory suggests in a 
typical MOT its one turn per volt :)

*********** REPLY SEPARATOR  ***********

On 17/01/2004 at 6:47 PM Tesla list wrote:

 >Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
 >
 >Hi,
 >
 >Trial and error ;-))
 >
 >Using a volt meter and some heavy wire that can take the final 6.5 amps,
 >just wind a few turns till you get to 5 volts.  It will not take many
 >turns
 >at all.  Then put the tube load on it and wind another few turns as needed
 >to get your 5 volts.  the current will work out automatically once the 5
 >volts is obtained.
 >
 >Cheers,
 >
 >         Terry
 >
 >At 08:17 PM 1/16/2004, you wrote:
 >
 >>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