[Amps] Toroidal transformers...

[robert briggs]

Hi all..I have been shopping around for custom built Toroidal 
transformers....My specs are for  one rated 250 volts AC input 
50CPS....Output 1100VAC @ 1 amp....1100va....I intend to use this unit 
for voltage doubling to run a single GS-31B triode....I finally found an 
Australian firm who can supply a Toroidal transformer  rated at those 
specs...170*80 (Diameter Hight)..

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..

Bob....
VK3ZL.....