Seeking Rotel RC850 schematic ..and other help

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Can anyone help? Also, any tips on how to overcome the problems mentioned below?

Bought this preamp for ~US$53 (that's R450 in my country). Uses NE5534's (or 5532's? -I forget), and I would like to tweak it a bit. There is a bit of crosstalk between inputs, and the volume pot (cheaper ALPS) has a bit of an imbalance between the two channels.

I can also hear breakthrough on the left channel when the volume is turned down all the way.

Your help would be much appreciated.

Shaun
 
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