Rodek 2180A small question

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I found this for about 70$ and it looks like a nice design it has got 3 pairs of tip35c/36c on each channel.
The board is from 1992.
It looks like there is a bias adjusting pot but i don´t have any values.
The box looks like plain aluminium, is it possible to polish out some scratches or is it treated with some surface treatment?
This one is flat on the bottom and rounded on top.
made in USA not china.

Pelle
 
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