On Thu, 16 Mar 2006 11:17:50 GMT, "housetrained"
wrote:

Is this the reason why one of my amps has its own power supply. A separate
box that sits next to the pre-amp and transforms the mains into DC?

All amps have their own power supply that does exactly this. Whether
it is in the same box or not is entirely immaterial.

d

Pearce Consulting
http://www.pearce.uk.com