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Mine is a deep sinus tone around 50-60 Hz. The amplitude varies between the days/sometimes between the hours. Pretty annoying, even though it's most prominent in quiet environments, and I can imagine having a loud high pitched tinnitus would perhaps be worse.

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this immediately struck me as a possible example of "The Hum"[0], although that is said to "peak at around 40hz"

[0] https://en.wikipedia.org/wiki/The_Hum

And on the main topic, i occasionally have ringing ears, and about 90% of the time i know why (usually a loud engine that i wasn't wearing protection near), but 10% of the time, like during a quiet weekend at home - it appears out of nowhere. I am not sure what my frequency is, but it's well over 1khz.

Are you sure you’re not hearing something real from the electrical grid?

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