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Digital noise, vintage equipment

Laptop with SSD, USB DAC, updated PAS 3, Fisher console amplifier also updated. Over time, began to hear a whine between songs or very quite passages, that builds, stops, rebuilds. Soft, but annoying. I don't have a spectrum analyser, my guess is the noise is in the 3 - 5KHz range.

Unplug laptop, so it is running on battery, dead quiet. So I figure it is AC conducted noise. Not much space so I filtered with Furman AC-215, it attenuated the noise about 50%. I turn off preamp, noise also halves so probably picked up through preamp and amplifier.

Replaced with Sherwood 5000, no noise. I would like to go back to the PAS and Fisher. Could sure use some insight/suggestions as to how the Sherwood is filtering the noise and apply it to the PAS and Fisher. Thank-you in advance.



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Topic - Digital noise, vintage equipment - fredtr 20:54:06 07/14/16 (10)

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