[tonymillion]

I have something similar - or rather I thought I did.

An incredibly high frequency sine wave noise almost inside my head.

I remembered when I was younger (a long time ago - early 80s) that I used to be able to “hear” when a computer CRT was on in my school computer room (uk, so BBC micro, with the standard monitor).

Ultimately I figured out I could hear the switching frequency of poorly designed / made power transformers.

specifically 110/220v to 5v or 12v transformers and cheap USB outlets.

I spent a day up close and personal around all my power outlets and now my head is clear of that super-sonic ultra high frequency nightmare.

[geoelectric]

I could hear flyback transformers growing up, too—-I could often tell from outside when someone had their TV on, even when adults couldn’t hear it at all.

Unfortunately, that frequency is a pretty accurate comparison to my now ever-present tinnitus. It’s not fun.

[lisper]

Well, this is interesting. I was going to respond: I hear it even when I'm outdoors so it can't be transformers.

However, then I decided to check if my phone could hear it, so I fired up my DB Meter app. And funnily enough, there is a little spike right around 12kHz, which seems to be right around where my tone is. It's not a huge spike, but it's definitely there.

Weird.

[wizzwizz4]

Is the sound from your phone?

[lisper]

It's possible that the spike shown on my phone is some kind of artifact. I'll need to get another device with a DB Meter app to verify. But proximity to my phone doesn't affect my perception. I can hear it even when I'm outdoors without my phone with me.

[ForestCritter]

I started getting tinnitus shortly before moving from upstate NY. They were in the process of plastering the town with 5g every block or so. Since I've moved to rural MO in an area where even Verizon drops calls it is completely gone. Gotta wonder...