Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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Re: It would appear that EVERYBODY has missed the most important item.

Posted by jneutron on November 6, 2006 at 09:47:45:
DB: ""
Unfortunately, this all happened about five years ago and the line cord has long been returned to the critic.
Why did it take so long for you to write it up??sheesh...:-)
DB: ""
When I noted the reactance and resistance of the "tunable line cord" it was in reference to a standard IEC cord. Not much of any difference that I measured in that regard between the two. ""

I would not have expected much of a difference between the two. If you measured hot to neutral inductance with the far end shorted, the difference should be trivially small. It is the ground loop you should have measured.
DB: ""
At the time I was so overwhelmed that people would spend hundreds of dollars for something that certainly appeared to make things worse as opposed to better, and the simple replacement back to a standard line cord ending the problem certainly compounded my near total disgust/puzzlement.

It made your system worse, at the locations you tried. Unfortunately, since you did not have a reasonable hypothesis which considered ground loop issues, you did what you could.
DB: ""
In 20/20 hindsight I should have held onto it longer and made further measurements.

Hindsight is so exact...and never on time..:-)
DB: ""
However; I have a gut feeling that no matter how much data I took it would not really change anyone's belief systems nor change anything going on in the market.

That's gloomy..
My take, is once the interaction is understood, it can be done scientifically.
If it can make it worse, then a presumption is that it can make it better. The question is, how to find the sweet spot using instruments.
DB: ""
I also got on the phone at the time to the "designer" of the power cord. I distinctly remember that he did NOT want to discuss the - 25 degree change of phase in the current, and neither did the critic.
With attitudes as I have outlined above, it appeared to me at the time that I was running into a brick wall of ignorance and apathy or something along those lines and therefore did not pursue this further.

What made you think the designer understood what was going on?
DB: ""
Let sleeping dogs lie?

No.
There are far more sensitive test methodologies that can be employed, and given your experience of hearing a huge difference, it would be easy to correlate the measurements to your hearing.
Cheers, John