[Boatanchors] Are 400 Hz variac's good for anything but a real 'boat anchor'

[doc at kd4e.com]

I am math-challenged, or more precisely, algebra-challenged.

Are you saying that a 400Hz device operating at 60Hz has
to be downgraded 6.5:1?

So if he stayed with 120vac and the device was rated 65A @ 400Hz
it would be good for 10A @ 60Hz?

So one rated at 10a @ 400Hz would be good for ??? @ 60Hz?

I am interested because I have a pair of selsyns/synchros that are
rated at 400Hz and finally have a purpose where I can see if they
are functioning correctly and can handle a little torque (turning
a big roller inductor).

> The issue is core saturation. If you run it at a lower input voltage, 18 V
> or so you can still run it at 10 amps out. It's still not too useful, but
> you could use it with a transformer for a variable filament supply or low
> voltage power supply.
>
> 60/400*120V = 18V
>
> John,KU6X
>
> -----Original Message-----
> From: boatanchors-bounces at puck.nether.net
> [mailto:boatanchors-bounces at puck.nether.net] On Behalf Of Robert Groh
> Sent: Saturday, July 16, 2011 8:59 PM
> To: Boatanchors List
> Subject: [Boatanchors] Are 400 Hz variac's good for anything but a real
> 'boat anchor'
>
> Some wise guy at a hamfest today left me a 120 V, 10A, 400 Hz variac as a
> 'present'.  I know darned well you can't pull much amperage out of them due
> to
> the small core saturating but can you pull much of anything in amps? I'm
> inclined to just yank off the knob and dial scale and pitch the rest.
>
> By the way, if anyone wants this for the cost of shipping, they can have it.
>
> 73
> Bob, WA2CKY
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