10 amps is pretty marginal, yes. But he might just get away with it,
provided he doesn't use a continuous-duty mode like RTTY. That 10 amp
rating is for CCS, not ICAS.
My HV Variac (a Staco type 1250) in my legal-limit amp is only rated for
(IIRC) 12.5 amps, and it doesn't overheat.
73, Mike
www.w0btu.com
On Mon, Feb 2, 2015 at 3:38 PM, Paul Hewitt <wd7s@earthlink.net> wrote:
> This works if you have a neutral in the psu but you will be limited to ten
> amps for the plate transformer primary, pretty thin for most legal limit
> amps.
> 73, Paul
>
> Paul Hewitt
> WD7S Productions
> QRO Homebrew components
> http://home.earthlink.net/~wd7s/contents.htm
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Mike Waters
> Sent: Monday, February 02, 2015 12:58 PM
> To: amps@contesting.com
> Subject: Re: [Amps] Variac Question
>
> It sounds like a 115 volt-only Variac, so you can use it between the
> neutral
> and one 240V leg. You just connect your 240V plate transformer primary
> between the Variac wiper and the remaining leg of the 240V circuit.
>
> That's the way my filaments are wired in my dual 833C amplifier. You get
> finer control of the voltage, but you can only adjust the primary between
> 120 and 240 rather than 0 to 240.
>
> 73, Mike
> www.w0btu.com
>
> On Mon, Feb 2, 2015 at 2:41 PM, Larry <LKIRKLAND@sc.rr.com> wrote:
>
> > I am building an amp and have started gathering parts for it. My
> > plate transformer secondary is rated at 3500 VAC. Thats a little much
> > for what I need. I need to end up with about 3500 VDC for the amp. I
> > found an old General Radio Variac type V10 good for 10 amps, but I'm
> > not clear if it can be used on 220 VAC. The wiring diagram on it says
> > "volts shown for input
> > 115 volts 50-60 cps."
> >
> > My question is Can I put 220 volts across the coil without smoking it?
> > I'm thinking that it would work.
> >
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>
>
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