Qinpu SP-2 Avional USB Mini speakers notebook pc 2010
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friend recently bought Yaqin MS23B Stereo Tube Phono Stage. found a slight hum. tracked it down to the common earth returns on the input sockets as soon as I split these making effectively two seperate circuits the hum went away. hopefully you can make this change to make this a perfect product.
Date Added: 02/01/2019 by Jo** Kn**h