>I recently noticed a persistent background >hissing noise that is not ambient
>but exists >inside my head
Mine is the same frequency as the 18khz oscillator in old CRT televisions.
Actually, it's a tritone, all around the same frequency. Sounds like a cricket
chirp, except continuous. I've had it for many decades.
It never goes away. Ever.
At least you're not hearing voices in your head...
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