I've also had a hiss since start. When I think of a ring I think of a kind of school bell or something like that, never had T that sounds like that.
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If it hasn't changed, then I guess that's really good.
@Stacken77 why?
Sorry, wrote in haste from my own point of view since I have accumulated a bunch of pure tones and ringing which is not pleasant. Of course, it would be even better if your volume lessened, or if the T disappeared. But if it's a hiss, and it's fairly stable, I think you have a very good chance of habituation and ultimately a normal life.