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In Reply to: RE: Resistor noise on AUDIO applications posted by fmak on November 28, 2010 at 07:42:23
The only thing involved in audio is PHYSICS. There is no MAGIC involved, though some manufacturers are delighted that others believe the opposite.
Follow Ups:
If you believe in Physics, you should note that Vishays 102s have very low TCMs.
I am an engineer and it is no secret that many electrical engineers educated in the basics of ideal components find such things as capacitor sound, cable directionality etc 'unscientific'.
So, there is the Physics of 'ideals' and Physics of 'realities'.
In my last job, I was responsible for parametric test in a wafer fabrication facility.
One test, a simple breakdown measurement, gave inconsistent results on some wafer designs only.
I studied the parametric test probers and discovered a funky ground connection to the wafer chuck. The prober designers had followed good star grounding practice in most of the machine, but had lapsed on this one connection. The design engineer for the test structure layout on the affected wafer designs had neglected to place adequate substrate ties around the problematic structure. The net result was false flags of below-normal breakdown voltages on perfectly good wafers.
The world is full of half-assed designs created by 'scientific' engineers.
"The world is full of half-assed designs created by 'scientific' engineers."
Naw, not full at all. Compare the engineering contribution to society with say politics or religion. We're good! Most bridges, dams, roads, TV's, toasters, stereos and telephones work well and last a long time. But not all of course as perfection is a limit not a possibility.
Regards, Rick
But now analyze the physics behind thermal noise, as mentioned by Rick M above, the physics of the resistive material used, the method of attaching the lead out wires, the material of the end caps and lead out wires, the density of the spiral conductive material, the physics of the type of insulation used on the resistor body, etc., etc.
A resistor often is not purely about resistance.
Stu
Believe what you like(or rationalize the physics and call the rest of it magic) but if you care about audio then at least try a few TX2575 in critical locations.
Someone has tested the results of replacing conventional resistors with bulk metal foil resistors in the FEEDBACK network of a power amp?
Edits: 11/28/10
Of course, not only is the feedback R important but also the type of C. These are well known subjects if you are really into audio.
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