the sound comes through the headphones.
Is the sound present on all inputs?
Does the level change with the volume control?
Never heard an amp do this before, ideas?
I have a primaluna 100 unplugged from any inputs. It has this awful high pitched sound coming from the speakers when it's turned on. It happens on both channels, and through headphones.
I have turned off all electricity in the apartment, turned all breakers off except the one it's on, moved the amp around the apartment, tried a humx, and different power cables. I even replaced the unit with another primaluna and they both do it.
I'm running out of ideas, anyone ever seen this before?
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I too was stumped when there was noise in my tube preamp and in my tube phono. Turns out to be the Wi-Fi modem and (especially) repeater boxes were too close to my equipment. I could hear the noise abate as I moved them 12 -15 ft away. It falls off rapidly in an electromagnetic inverse squared fashion ....but if even turning off your internet equipment doesn't have an effect, it could be your neighbor's. |
Alright, the faraday blanket lends support to the "external radiation"/Wi-Fi theory. As a (possibly amusing/enlightening) side story, I had tried substituting other equipment as part of my logical deduction, detective methodology and found that a solid-state version didn't suffer the same noise (both pre and phono) and so, the units were obviously the problem (I thought/but really, just better shielded). My technician was not able to duplicate my problem but charged me anyway. When I finally figured out what the problem was, I shared that with my technician, hoping and even suggesting that maybe he shouldn't have charged me. His wise response: "Turner, it's always what you don't know that costs you." Think "out of the box/system" if all else fails. |
There's an Android app NetSpot that will show the level of WiFi RF in the area. Sitting right next to home router is usually about -40dBm. There are relatively inexpensive RF detectors available. The Best RF Detectors for Detecting EMF and RF Signals in 2022 – SPY BUT, even if you find the source, getting something done about it may be difficult. Since the sound is present on all inputs, you could pull the power tubes [labelling them first to restore to the same socket] to see if that makes a difference. Only power the amp for a couple of minutes as B+ will be high without the power tubes.
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