![]() ![]() ![]() I mproper grounding - faulty input cables will produce hum also.Swap another cables to confirm that this is not the caused of the problem.Bad solder joints in the input jack will do the same symtoms. ![]() You must work in the brightest area or used table lalmp/portable lamp and magnifying glass because this is hard to spot.ģ. Bad solder joints (crack/dried/cold) - bad solder joints in the filter electrolytic capacitor, output IC, pre-amplifier stage, will produce hum in sound. Affected section is the power supply section,pre-amplifier sectiona and/or the sound output circuitry.Ģ. Sometimes it has a bulged/dome at the top but not all, you must have a capacitor checker to determine its condition. Dried/leaky electrolytic capacitor will produce an out-of-regulation condition. Bad filter electrolytic capacitor - this is the most common caused of hum in sound. Hum in the sound is commonly cause of the following :ġ. ![]()
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