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Sansui C-77 pre-amplifier repair. Case # 356465

Case #356465. Sansui C-77 preamplifier repair.

Different output signal level in left and right channel . Unbalanced output signal .
Changing double front pot 100k ohm ” volume” solved the problem.
Cleaning did not helped.
One of them for some reason changed value to 60K ohm.