What could be causing a power hum for about 1 to 2 minutes after startup? Sony STR-DE825
Depends where the hum originates. If it is from the case, it is likely from the transformer which may rattle laminations a bit till it warms.
If it is out of the speakers, then the amplifiers MAY not be balancing till warm up... that would not be good... keep your eye on that and if it gets loud, take it for repair ASAP.
If unit is old, the filter caps may be going bad OR there may be a bad solder joint in the power supply area that doesn't contact till it gets warm... that also needs fixing ASAP.
×