On 2/5/08 8:45 AM, in article , "Arfa
Daily" wrote:


"William Sommerwerck" wrote in message
...
One point hasn't been brought up.

If one or more of the caps are bad, then it's likely you'll hear hum even
with the volume control all the way down. If there is no hum with the
control the way down, the problem is probably elsewhere.

Regardless, it wouldn't be a bad idea to simply replace all the PS
electrolytics in a 35-year old receiver.



I'm not a great advocate of the 'shotgun' approach with this type of
equipment. A lot of times, a person who has little electronics skill, as
this poster told us he didn't, can cause himself more trouble by just
replacing items 'willy-nilly'. It's very easy to make a wiring or polarity
mistake. And once he has, he will be in even worse trouble than before, as
he now has both the original problem, and the one he's caused himself ...

I did actually say in my first post in this thread, that hum as a result of
a power supply problem - for example a bad cap - will not usually be
affected by the volume control, so by implication, will still be there with
the volume at minimum.

Arfa




But the loudness of the hum will, like a mixer, follow the volume control if
the problem is a power filter common to the preamp.