Posted on July 1, 2022July 1, 2022 by Provo Electronics Case #356465. Sansui C-77 preamplifier repair. Different output signal level in left and right channel . Unbalanced output signal . Repair. 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. Post navigationPrevious post: Case #456718. Technics SU-7600 amplifier repair. No sound.Next post: Case #356461. Pioneer SX-626 receiver repair. Low, distorted and wobble sound.