The heart of the Avant 32 is a digital electronics box (called the US Box in the US). This unit is also in the Beosystem 1 which are available second hand. It is a straightforward swap. If you can get one cheaply it is worth a try.
thanks, Gregg, I will have a look for the Beosystem 1.
Do you know if there are any technical schemes available showing the construction of the Avant 32?