Re: [TCML] 400 hz variacs

[EVP <evp@xxxxxxxxxxx>]

   Yes, they can be used as variacs if you reduce the voltage by a 
factor of 60/400.  A 120V 60 Hz variac would thus becone ab 18V, 400 Hz 
variac.  I've done that with far bigger ones to control the output of a 
filament transformer.  I doubt that they'd be useful as ballasts because 
the cores would probably saturate under any useful operating conditions.

Ed

HomerLea@xxxxxxx wrote:

> I have a bunch of 208v 1.3 amp and some larger variacs, all 400 hz. Can 
> these be used as variacs at derated in voltage on 60 hz or are they just good 
> for ballast?
> Jim Heagy
>
> homerlea@xxxxxxx
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>  

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