Micromega Stage one transformer

Hi everyone!
I need your help with a Micromega stage 1.
In this period there is a vibration that comes from the transformer after I use the Micromega for around 1 hour.. Then I think I should replace it. Do you know where I can find one? Or do you have the technical specs of it? Or better the diagram/schematic of the Micromega ??
Thank you!!