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Ive had it for about 30 years. Mine is a high pitch ringing sound. An I can change the pitch by moving my jaw left to right. My volume that I hear is equivalent to about 90 decibels. I also hear 3 or 4 different levels of sound at one time. However I do hear my heartbeat all the time. I actually helped me to diagnose my irregular heart beat to inform the cardiologist. Have to have fan noise to sleep. Most of the time I can ignore it, but typing this damn response, thinking about it, its driving me nuts even after 30 years.
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