I just replaced the tubes on my open fit mini BTEs (Resound Azures) and the sound quality really improved. The tubes were only a couple of months old and they didn’t look too bad. Has anyone else noticed this to be the case? I think the plastic gets soft after a while and there is a tendency for the tube to pinch a bit. Maybe it also gets some kind of residue coating the inside of the tube from the moisture in your ear, etc.
This makes me wonder if I should change the tubes more often.
How often should I be replacing the tubes?