Looking for TRIAD R-11A transformer

Not an exact match, but have a look here:

at items P-T273DX, P-T273DZ and P-T273BX. If the low voltage secondaries are important, you might have to get a couple transformers to boost the current a bit.

--
Dave M
MasonDG44 at comcast dot net  (Just substitute the appropriate characters in the 
address)

"In theory, there isn't any difference between theory and practice.  In 
practice, there is."  - Yogi Berra

Consider rewinding the transformer; I have used the services of a nearby rewinder (in the U.S.) when it is impossible to obtain a replacement transformer. In my case, I disassemble the old one, note the wire gauge and details of each winding, and count turns while unwinding (you may also slice the windings carefully off of the cores and count turns and layers in the slices) and provide this data together with the laminations and structural parts to the rewinding house. Their rates have been surprisingly affordable.

Regards,

Michael