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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