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Hum is a multi faceted problem. We have identified 4 completely different causes of hum in amplifier power supply transformers exacerabted by AC power problems - and that kind of hum is not even the most common hum audiophiles have to deal with. The no 1 cause is ground loops in interconnects - which is outside our purvue. PurePower can effectively eliminate amplifier transformer hum from AC power supply causes - including DC offset, asymetrical voltage waveform (sometimes called virtual offset), common mode noise from faulty grounds and current waveform anomalies caused by asymetric current draw by amplifier power supplies.
All of these hums are distinct from hums entering the signal path and emanating in the speakers - this is mostly unrelated to AC power issues and again outside PurePower's purvue.

If anyone is waiting for a PurePower technical solution to amplifier transformer hum then please email me with details. We can help with these. richard@purepoweraps.com

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