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Sideband · 13th Feb 2018, 2:36 pm

Agreed. The power supplies are derived from the line stage and the main switch mode supply, neither will give an audible hum if there is a problem. The SMPS runs at around 60kHz so you won't hear a hum if any decoupling is faulty.

13th Feb 2018, 2:36 pm	#3
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,578	Re: Philips SG90AE hum Agreed. The power supplies are derived from the line stage and the main switch mode supply, neither will give an audible hum if there is a problem. The SMPS runs at around 60kHz so you won't hear a hum if any decoupling is faulty. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman..... Last edited by Sideband; 13th Feb 2018 at 2:46 pm.