found a cheap solution, this is an external grounded power supply that avoids the hum
47 euro at Thomann
Mooer Power Adapter for GE300
Posts by PeterLeonard
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I have had the same issue on my player and found a simple and cheap solution.
I use another power supply (47€) that eliminates the annoying hum
Mooer Power Adapter for GE300Mooer Power Adapter for GE300 & GE300 LITE (3000 mA); Netzteil für Effektgeräte (Mooer GE300/466236 & GE300 LITE/498344); 9V DC Ausgangsspannung; 3.000 mA…www.thomann.deWith this power supply the Player is grounded and I can use it stand-alone with my guitar and headphones without this hum on the headphones out.