Amplifier bias ajustment question

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1200GXman

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Hello all

I was busy adjusting the bias of my Rotel RA-935BX amplifier which was never done since its construction. It should be 6mV according to the manual.
It was hovering at 7 to 8 on both channels. My concern is I am struggling to get it to 6mV precise which is obviously normal due to it being very sensitive on the adjustment screw.
I am able to get it either 5.5mV or 6.3mV
Which one must I rather put it on? currently it is on 6.3mV
 

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