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Transformer noise including Powervar

First, all transformers make acoustic noise. That is their nature. But the manufacturer should know how to limit or dampen these vibrations to keep them pretty much inaudible.

The transformer in a power conditioner or power amplifier will make audible noise for primarily one reason: improper AC input. All transformers require a constant specified voltage and frequency just like all other electronics. The AC input requirements are specified on the rear of the unit.

If one feeds the unit improper voltage or frequency, the magnetized plates in the core of the transformer do not operate properly and rattle…hence the noise. And this information comes from the chief engineer at Powervar.

Powervar and many other power conditioners do not regenerate the AC sine wave or regulate voltage or frequency. The AC that goes in comes out less AC TRANSIENTS and AC NOISE.

With that being said, there are many AC line sources that can cause transformer noise including DC on the mains. If you are interested in understanding what they are and becoming educated on the subject, I suggested highly that you read the following article and focus on section 3. “Adverse Mains Conditions”. Go to: http://www.plitron.com/PDF/AES.PDF The article is excellent.

So if you are going to use a Powervar, you should feed it proper AC sign wave. The AC can be full of transients and noise but it has to be the correct voltage and frequency. The Powervar will clean the transients and noise but it is not going to change the sine wave. One can only do that with a regenerator and that comes with a price of course.
drdokman1

Showing 1 response by ausjoe

ausjoe
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Drdokman1
Good post! I Hope this isn't straying too far off topic. EI frame transformer magnetic fields brought up a thought i've been thinking about ie. separating the Amp from the preamp. I've heard 3 feet to be a minimum to avoid magnetic field effects fom the power amp. That would require a awfully large space around your amp, perhaps even removing it off the component rack. This, at least for me, would result in at least 1.5 meter interconnects which doesn't fit in the shorter is better camp. Recently i came across quarter inch stainless steel plate. Would this when added to shelving be enough to shield the preamp from the EI frame transformer? If not are there any other solutions beside distance.
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