[Amps] Variac Question

[Mike Waters]

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 at 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.
>