Technical Articles

AVR - Audio Video Receiver - Build Quality: Part I


Use of Relays to Achieve Better Performance

In stereo equipment, relays often substitute for solid-state switches. This is costly and can create reliability issues since the relay has mechanical parts; to the positive, the substitution imposes no noise or distortion. In an AVR or pre/pro built with SSI parts, a relay can replace transistor switches for routing analog signals inside the AVR. None of the products for which I have a service manual deployed relays for stereo analog input selection. I suspect higher-priced pre/pros produced in North America may use relays for this function, but cannot confirm this. I did find a relay routing the signal to the electronic volume control in one product.