Tube DIY Asylum

RE: Hum pick-up

24.140.86.80

In Reply to: RE: Hum pick-up posted by thermionic addictions on July 02, 2009 at 14:03:15

Hum is usually due to : incorrect grounding, component layout issues/routing of wires, or not enough capacitance in the PS, IME.

As long as all grounds go to a single point, I don't get hum issues even with AC filaments. I keep the RCA jacks isolated from the chassis to avoid ground loops.

With indirectly heated tubes, 1-2mVAC at the speaker terminal is the usual standard for my builds. Sometimes I have measured 0mVAC hum.

maldar

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