Re: Paralleling Filament Transformer VTTC

["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>

Dan,

there is no reason that wont work, and there may be a benefit, but really 
if you can control the transformers independantly with variacs (too much 
hassle).  Here what i did for my 10V 20A supply.  Fair Radio Sales (do a 
search for the website) sells a 20V 20A transformer for $20 i 
believe.  They dont tell you that it has essentially 2 primary coils.  And 
when you series and phase them properly, you get down to about 11v.  Then, 
open up the casing and its easy enough to take off about 3 turns of the 
secondary as it is exposed when you remove the copper band and some 
insulation that wrap around the core and coils.  So now i have a 
transformer that puts out 9.9 - 10.3 V depending on my line voltage.  At 
120 in, its exactly 10.0v output ;)  And the $20 is pretty good for such a 
transformer!  And since its rated 400W, this 200W load is nothing for it, 
so it can run cool all day long i bet. Hope this may help.

Steve Ward.






>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Paralleling Filament Transformer VTTC
>Date: Mon, 03 Mar 2003 12:06:00 -0700
>
>Original poster: "Mccauley, Daniel H by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
>
>
>
>Regarding my dual 833A VTTC, is it more beneficial to parallel my 10V, 10A
>filament transformers or to have each one
>ran by its own filament transformer.  I tried to look for a 10V, 20A
>transformer but couldn't really find one off the shelf
>with less than a few month lead time and I'm too lazy right now to wind my
>own.
>
>Thanks
>