Fi Evolution preamp transformer question

I have one of Don Garber's Evolution preamps. The transformer has burnt out and I am looking for a replacement transformer.
Might anyone know which transformer Don used for the Evolution?  I think it may be a Hammond but I am not at all sure. Any idea of the make, model number, or source where I can get a replacement?
Much thanks.
Ted Kurtz
tedkurtz@optonline.net