Question about JVC TH-M505 System
Maybe one of the audio leads does not have a complete earth shield and until the second lead is connected, the lack of a suitable earth shield produces the 50Hz 'hum'.
If you should connect either of the two the centre conductors to your body, YOU will introduce a similar hum due to your body acting as an 'earth' to that signal carrier.
These are frequently common effects and it may be a good idea to turn the volume level down on the amplifier or even turn it and the VCR OFF whilst you make or break these connections.
Posted on Aug 05, 2008
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