What transformers are you talking about?Why are the transformers not rotated 90 degrees to each other and/or encapsulated with mu-metal?
Input transformer is PCB mounted and is mu-metal shielded. Output transformer does not have to be mu-metal shielded because the signal level is quite high.
90 degrees rotation is used between power transformer and input or output transformers to minimize the induced mains frequency. This is more relevant to the EI core transformers. My power transformer is toroidal. And it is mounted in such a way that minimizes induction to the sensitive input networks and input transformer.