On 03/01/2010 14:03, Brian Reay wrote:

If you rectify AC you replace the 50Hz sinusoidal "hum" with a 100Hz "rasp".
True, you can regulate and filter but anything left will be more "hash" and
probably more in the hearing range of the ear.

As the audio guys who have joined this thread have generally acknowledged, a
lot of this "noise reduction" is in the sphere of counting angels dancing on
pin heads.

True enough, but the induced 100Hz would be of far lower magnitude than
using a pure AC feed. As lordgnome says, he tried it a long time before
it entered my head, and with excellent results. I have it in the back of
my mind for years to design and build a setup worthy of my living room

A good hi-fi set up is a joy to behold (or listen to!), so I can
understand the aspiration. I think a lot of it is driven by a chequebook
mentality though, and those writing the cheques wouldn't have the
technical nous of our friends on the audio group. This thread is an
education in itself.

--
All the best for 2010 de Walter.