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In Reply to: RE: I note you didn't posted by Tony Lauck on June 26, 2009 at 10:33:18
Of course, there's always a possibility of amplifier being defective - it's just that being affected by power cord change is in no way or shape the sign of "defectiveness".
More experience with resolving equipment, and less preconceived notions in the head - that's best possible cure against such "defects" in amplifiers.
Actually I was quite serious.
I have had a defective amplifier, and it was in the power supply, no less. As it turned out, the defect wasn't at all subtle—it resulted in a moderately loud hum in one channel. The amplifier had separate output filter capacitors for each channel and one of the four had gone bad. The manufacturer had gone out of business and there was no direct replacement available at "You-do-it Electronics" so I substituted four new capacitors of slightly larger size, which fit only when held in by duct tape. Interestingly enough, the result was a significant improvement in sound over what it had been prior to the failure. I presume that the original capacitors either lacked sufficient energy storage capacity when new, or perhaps had gradually lost their capacity over time.
Had the failure been in the input power line filter then I might not have noticed it, at least not until I moved into an environment with lots of EMI. At that point, I might have effected a sonic improvement by replacing the defective internal components or by attaching an external power cord that provides rejection.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
In this instance I have to rely on the veracity of bjh's observations - ie. they are presented in such a way that indicates it's not a one time observation and have been repeatable in a variety of different situations. At least that was my take on the wording of his opinion of Bryston equipment.
In my normal work environment when issues come up the first thing I like to do is to witness them. Whether this occurs in the lab or I reproduce them at my desk kind of depends on the importance and severity of the issue.
I agree with your take it could be a defective unit and the defect could be for one of any number of reasons. However and again - the comments I'm relying upon indicate this is the normal performance one achieves from the Bryston amplifiers in question.
Often when I get to the lab or reproduce the issues as described by a customer, technician, marketeer or even other engineer the issue is actually quite different than the description. I'm giving bjh the benefit of the doubt for the purposes of this conversation.
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