Case 432200. 12/27/2024. Sansui AU-719. Increasing volume leads to cut left channel in half.

Case 432200. 12/27/2024. Sansui AU-719. Increasing volume leads to cut left channel in half.
Nice amplifier. Build to last. Problem acting as bad volume pot.
After detailed diagnostic found contacts oxidation on speaker protection relay. Relay replacement solved this problem.