Re: Weird consumer problem
- From: "Soundhaspriority" <nowhere@xxxxxxxxxxx>
- Date: Fri, 30 Nov 2007 08:13:38 -0500
"Paul Stamler" <pstamlerhell@xxxxxxxxx> wrote in message
news:1XM3j.1205$MJ6.1034@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi folks:[snip]
[snip]
Utterly bizarre behavior. How can plugging an additional component into a
po
wer strip, without connecting that component to anything, cause a
turntable-and-phono-preamp in a receiver to begin buzzing?
Paul, I had a similar case that may give you some insight. Then again, it
may not. This was a high-draw power amp, connected to the mains through a
Parasound SCAMP, which is a power switching device. The SCAMP has an audio
input, a low voltage trigger input, a pair of good quality gas filled
relays, and, of course, a mains connection.
The SCAMP causes hum to appear in the power amp attached to it. By
elimination, I concluded that the slight resistance of the SCAMP relay
contacts, or, possibly, contact rectification, is the cause of the hum. The
point of the example is that hum can be created by very small voltage
differentials. Resistance differentials can exist in AC wiring that are
completely negligible with respect to power dissipation.
Also, is this a simple strip, or does it have a filter? If it does, then the
point made by Chris Hornbeck may be particularly relevant, since the filter
would create a high impedance path between the CD player hash and the mains.
This is one reason why some audiophile strips have independent filtration
per outlet.
Bob Morein
(310) 237-6511
.
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- Weird consumer problem
- From: Paul Stamler
- Weird consumer problem
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