Ya , Still working on it...This diode is in the secondary pwr supply section.. This part number comes from the repair manual parts list. It looks like a zener(glass)... Leave to NAD to make things difficult...
There’s no such part as a G13B. If you look carefully at the schematic, you’ll see it’s a bridge made up of four G3B rectifiers. They’re nothing special - just a generic 3A 100V rectifier.
