How Much DC is OK on a Power Line?


The other night my Classe amplifiers started producing a substantial mechanical hum. Classe told me that it was likely from DC on the power line. The hum was there even when the preamp was switched to standby, and even when I plugged the amps into different sockets.

My questions:

1) how much DC on the powerline does it take to cause problems with audio equipment?

2) How does DC get into the AC signal on the power line?

3) Do the power companies have any spec they need to acheive for maximum DC?

4) Or is it more likely appliances within my house causing the DC.

Thanks, Peter
peter_s

Showing 2 responses by pcoombs

whould a power regenerator (Purepower, PS audio) remove the hum/buzz caused by the DC on the line?
I've been told that a buzz/hum from an amp can be caused by "odd harmonics on your home AC". Is this the same as 'DC on the line' as Peter in first post was told ? And if different what sort of conditioner is best to 'cure' this?