@macg19 "However there is no way to actually measure the frequency of the tinnitus tone that I am aware of."
Actually, I found it pretty simple. i sat down with a set of headphones, with the amp hooked to a signal generator. I simply adjusted the tone frequency in the headphones until it matched what was in my head. In my case, that was about 9 KHz.
I've had tinnitus for 30+ years now. The ENT I saw told me it was likely ear damage dating back to the 1970s when I was a concert sound engineer. The follicles in the ear are each thought to be tied to an individual brain cell, and when the hairs are damaged, the brain cells end up disconnected and bored, and make their own noise, kind of like a bored kid drumming their fingers. No idea if that's actually the case, but it does make sense to me. I've got my noise constantly when I'm awake but have learned to live with it, just as I've adapted to all the other aches, pains and disfunction I've acquired as I've moved into my 70s.