Hello
so the brainstorm blasted away the good wishes
You should make a starground, with some substars. One center of a substar of the complete power supply is at the pin of the first capacitor behind the rectifier. Here you should connect all grounds from the transformer in one point. For every Stage aof the amplifier you should also make a substar.
If you chose the tranformer of TAD, its also possible to connect the ground of the separate ground for the bias, to the substar of the powerstage. You can try both and chose the one with less noise.
At least you connect all centers of every substar in one point. This is the center of the star of the input with the highest gain. here also you should connect the chassis. There are other ways to make a ground sounding ground, but this one works always under every condition and it is easy to explain and understand. So the danger of mistakes is much smaller than other methods.
I for myself build at first (10 years ago) two humming monsters. In this time I started to make stargrounds and never had problems with ist. Later I tested other kinds of grounding, they all worked in one amplifier and in the other not. Only starground is in my experience the alway working sure method. But mostly it's also very complicated to to, many wires you have to solder and it also don't looks very fine, in big amps it's more a nest of a bird.
Have a nice evening
Martin
