Yeah, I have a constant ringing in my ears, I've had it, or I've been aware of it since I was about 4 or 5 years old. It's a very high-pitched whine, almost exactly the same frequency as a TV, but not quite the same. And actually when I first noticed it I thought it was the TV, but when I went to check, the TV was off and I realized that it was all in my ears. I also realized that if I flexed certain muscles in my neck I could make the sound much louder and even block out other unwanted sounds, an ability which continues to serve me well. I suspect it stems from one of the many ear infections I had as a kid.
Over the past couple of years it seems to have been getting worse, but it doesn't seem to come with any loss of hearing. I can still hear things quite acutely, and on several occasions have been able to hear things quite clearly which others around me couldn't.