Like most vintage audio equipment from its era, the Technics SA-370S suffers from predictable aging symptoms. The service manual guides the diagnosis of these common failure modes: Power Supply Degradation (Humming and Noise)
What or issues is your receiver experiencing? Technics Sa-370s Service Manual
Because the "S" suffix often denotes specific regional variations or the integrated cassette version, owners sometimes use the standard manual for common amplifier and tuner sections. Like most vintage audio equipment from its era,