On 2/5/08 6:15 PM, in article , "Arfa
Daily" wrote:

(snip)

If it is a multi-winding transformer, then I agree that there is a distinct
possibility that there may be hum just on the supply rails to the preamps.


Arfa



That wasn't my point.

My point was that even if there is a faulty DC supply common to both the
amplifier and the preamp (typical low-end), changes in the volume control
setting will still be heard as an amplitude or character sound change in the
hum from the speaker.