Wayne Parham Messages: 18688 Registered: January 2001
Illuminati (33rd Degree)
I think line frequency hum (and its full-cycle rectified double) are probably the most oft-cited problem in audio. Ironically, this almost never plagues people running four hundred dollar receivers. Just the guys running expensive separates, who have to deal with ground loops and relatively long preamp signal lines. I think a lot of tube amps probably have relatively primitive power supply circuits too, so that probably introduces some hum as well.
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