Schematics or information on the old Adyton opera amplifer

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Hello,
I have an old Adyton Opera (circa 1993) for quite some time now.
It makes a little "hum" on the speakers, and it does come from the integrated.

Is there anyone with some schematics or information on the old Adyton opera amplifer ?

thank you very much.
 
The Adyton company also made PRO amplifiers for the UK brand Soundcraft. Maybe you can find schematics for those. I know the SA1000 shares circuit with the Adyton P-3.
Not sure about the Opera. What I do know is that it, by all means, is an excellent amplifier.
 
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