Hi RickyV and bobster755 and welcome to this forum .....
For what it's worth: I never had any tinnitus until after my first AN surgery, when it developed in my almost deaf ear (at the time). About a year/year and a half later, I began noticing tinnitus in my "good" (completely normal hearing) ear. Now I have roaring tinnitus in both ears (one completely deaf and one completely normal hearing), but no evidence of any tumor on my good side (most recent MRI was in January, 2018).
Most of the time during my active waking hours, I can divert my attention away from it. The more I focus on it the louder it gets. I have found that noisy environments will crank it up, as will too much caffeine, increased stress, and/or not enough sleep.