Tweet
When audio connections are made of different metallic elements, a Schottky diode can be created at the interface(s). This low voltage non-linearity manifests itself between 150 and 400 mVolts, well within the line input/output of audio systems low level connections. It produces a very harsh sound due to the rectification of the AC audio signal, with one side of the waveform having greater conduction compared to the other side. A common metallic combination that contributes to this distortion producing mechanism involves things like RCA jacks interfacing with RCA input/output connectors in which the cable end contains brass and the input connector to the electronic components are made with Cadmium plating. High end systems avoid this issue by using gold plated connectors on both end which are resistant to the corrosion which produce these Schottky (hot carrier).
Craig
ps - this is similar to a parasitic rf signal effect produced by what is known as rusty bolt syndrome on ships. It is also the same principle behind the physics of early cat whisker set radios.
Craig
ps - this is similar to a parasitic rf signal effect produced by what is known as rusty bolt syndrome on ships. It is also the same principle behind the physics of early cat whisker set radios.