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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Romy, your point is takenPosted by PurePower on: 5/3/2010
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You point out that if a capacitor can hum it is faulty and wound improperly.
You are absolutely correct - the way a capacitor is wound will determine if it can hum or not. Unfortunately almost all capacitors on the market are wound in a way that allows them to hum - even when they meet all other electrical specs.
Therefore my statement is correct. Most capacitors can hum.
Your statement that "If a capacitor can hum, it is faulty and is wound incorrectly" is a legitimate point of view. I agree with it as a requirement of acceptable capacitor quality. In fact, capacitors that meet the noise free quality level are the very capacitors PurePower uses.
The problem is, we had to do a whole lot of testing and visiting capacitor plants to find caps that are wound properly and meet the noise free test because the manufacturers do not publish their audible noise specification.
But if you make a general statement that all caps are silent you statement is incorrect. The reason is simple. Most caps are used in applications where hum is acceptable. Thus most caps do not meet your standards and are not acceptable for use in audio equipment.
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