Its not the efficiency but rather the size. For the same volume you get more
kva with a toroid.
This outfit has some interesting kits and it might help to ask them if they
would make a 240V primary.
http://www.toroid.com/standard_transformers/transformer_kits/transformer_kits.htm
Carl
KM1H
----- Original Message -----
From: "Roy" <royanjoy@ncn.net>
To: <amps@contesting.com>
Sent: Thursday, June 25, 2009 11:18 AM
Subject: Re: [Amps] toroidal transformers
>
> "...I am wondering what difference in efficiency there would be using the
> Toroidal unit in place of an EI cored transformer voltage doubled such
> as used in the Heathkit SB220 and other moderately rated amplifiers
> Dentron etc.."
>
>
> Aren't the original transformers at least 95% efficient? That doesn't
> leave
> much for you to improve upon, unless the toroid has gain!
>
> 73, Roy K6XK
>
>
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