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I have a port hooked up to a vintage music centre via analogue (obvs). All has been well but recently the port has started making a weird noise. It’s hard to describe, a digital noise that isn’t particularly loud but is noticeable. It almost sounds like something from an old space invaders game. It occurs every 56 seconds and regardless of whether music is playing. If I reboot the Port it will go away but returns after some time, don’t know exactly when. 
 

I’m presuming the Port is faulty but wondered if this was a known issue. Has anyone experienced anything like this? 

As I read your account I am reminded of an incident while repairing a tape deck on a military base. The repair was a success, but I suddenly noticed a periodic, raspy noise. I was completely flummoxed until, out of the corner of my eye, I noticed that the noise occurred every time a rotating radar antenna pointed in my direction.

I never assume a problem must be [ … ] or cannot be e … ], else I’ll likely be blindsided. I do, however, play the percentages. My first thought in your case is that there is an external cause.

Are you describing a noise that occurs while playing PORT through the receiver or when a receiver audio output is playing through PORT’s Line-In?

Does the noise level track the Volume control setting? Does the noise continue if you disconnect the audio input to PORT?

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