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Einstein "The Amp" (Integrated amplifier)

Hello! I can't find information about the EINSTEIN "THE AMP" integrated amplifier.

In partcular how to set the pre phono stage for a MM Nagaoka MP20 cartridge.

Also for using the cd player (Rotel RDC1072) the volume is already too high at the first level of the knob of the amplifier.
Anyone know this amp or can you help me find the manual?

Thank you!