That is the way it is hooked up. The A and B terminals on the ICM are connected to the corresponding supplies in the shoebox
Nonetheless there is some hum. Not severe but noticeable. That was why I was asking if I should use the filtered supply for both.
I'll double check but I am certain it is hooked up correctly.
Anyway I think I need to check the ripple on the filtered supply. The capacitor has a 1970 date so it may be a bit past it's prime.
