CH or anything that blocks hearing with fluid can causes hearing loss, and hearing loss causes tinnitus.
Tinnitus Talk Support Forum
Those audiograms have not been updated since the 1940's. they only test the the human voice range and tonal noises up to 8000hz. The majority of people with noticable hearing loss like myself can pass them.
How loud is your tinnitus? if you have tinnitus in cases other then neck jaw problems, you have some hearing loss even if super mild or caused by blockage like ear wax.