I am having to do some work (again) on this Viewstar PT-3000 amplifier. (This is a prototype which never went into production and is vaguely similar to the PT-2500.) It needs a new fan - does anyone know of the PT-2500's type and availability? Preferably a 240V version as the current 120V one is connected between live and ground... TIA 73 Roger VE3ZI