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Motorola 7 inch tabletop

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02-24-2018, 04:49 PM

Electronic M Electronic M is offline

M is for Memory

Join Date: Jan 2011

Location: Pewaukee/Delafield Wi

Posts: 15,445

Check grounds/B- on the chassis. If any signal grounds are bad it could add hum. Also look at the heater and line AC lead dress...If that is parallel to any audio lines or if there are adjacent loops of wire, capacitive or inductive hum coupling may result.

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