I need info on a George Wright Wla 12a preamp

Help. My George Wright WLA 12A preamp went down during a listening session, blowing the fuse. I took it in to a very credible repair shop who told me a winding in the power transformer was shorted. The tech asked if I had the schematic, needing to know the voltages to find a suitable replacement. I have looked all over the net and have yet to find the needed info. Can anyone help me with a suitable replacement transformer or some info as to what the proper replacement would be and where to source it? I love this pre, and have the matching mono 8's, a sweet system I'd hate to break up.