BOSE 550 AM/FM Винтажный стерео-ресивер, диагностика и ремонт

Очередной осмотр- ремонт винтажной аудио-техники.

Характеристики:
Bose 550
AM/FM Stereo Receiver
Specifications
Tuning range: FM, MW
Power output: 40 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.3%
Input sensitivity: 2.75mV (MM), 150mV (line)
Signal to noise ratio: 76dB (MM), 87dB (line)
Channel separation: 55dB (MM), 60dB (line)
Dimensions: 464 x 146 x 311mm
Weight: 7kg