Schematic needed: Sony Integrated Stereo Amplifier TA-FE610R

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Could anybody please help me find this shematic! Any ideas to mod it? Compared to Quad 606, Sony has poore sound, bass has no good attack, when I turn the volume up, the speaker protection gets activated and amp sweches off. Thought of removing the power amp, and put in 4channel Quad 520 -for bi amping. My e-mail: vassilona@hotmail.com
Thank you in advance!
 
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