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Maarten · 13th Feb 2018, 2:29 pm

A slightly misaligned IF stage will do exactly this. It is unlikely to come from any power supply line.

13th Feb 2018, 2:29 pm	#2
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,203	Re: Philips SG90AE hum A slightly misaligned IF stage will do exactly this. It is unlikely to come from any power supply line.