[R-390] Another (perhaps) silly ballast question

[Cecil Acuff]

I've been told it will cause the transformer to overheat and possible damage 
can occur.  May have something to do with the magnetic principals of the 
core etc...

Cecil..
----- Original Message ----- 
From: "Barry" <n4buq at aol.com>
To: "R-390 HF Receiver List" <r-390 at mailman.qth.net>
Sent: Wednesday, January 04, 2006 9:49 AM
Subject: [R-390] Another (perhaps) silly ballast question


> I'm not trying to be silly or attempt any cruelty to a dead horse, but I 
> do
> have another (perhaps weird) question.
>
> What is the effect of running a transformer's primary at less than its 
> rated
> voltage?  If I connect a transformer whose primary is designed to run at
> 120V to 100V, 75V, 50V, etc, what effect does it have on the secondary?  I
> realize the secondary voltage will drop at the same (or approximately 
> same)
> ratio as the primary's voltage is dropped, but what about current (or VA)
> rating?
>
> In other words, if I have a 120V-PRI/60V-SEC transformer and connect the
> primary to a 60V source, the secondary should now be 30V.  Is the
> transformer's efficiency compromised?  If the secondary was capable of 1A
> when the primary is connected to 120V, does the current rating go down as
> the primary voltage is decreased?
>
> I assume these aren't simple questions with simple answers, but I'm
> wondering about this for a specific reason.
>
> Thanks!
>
> Barry - N4BUQ
>
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