I believe that it weighs 41 Lbs.
I am not an expert; ok the truth is that I remember little of my electronics training (Navy 25 years ago). I asked for KG for a little input.
Here is a little info on what’s going on in a Balanced Power Transformer.
http://www.equitech.com/articles/widescreen.html
or another DIY possibility
http://www.geocities.com/jonrisch/catch2.htm