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Service manual for Benytone MA-4000 power amp

Hello to everybody in this nice forum. I am looking for Benytone's MA-4000 power amplifier service manual or at least schematics. One friend of me vandalized the power supply by adding a new transformer and now I am searching for power supply data together with idle current adjustment procedure.
Thanks in advance for your possible help.
Regards,
John



Is there anybody out there

Is there anybody out there can help?