Hello, I am new to Cb radio and found an old Cobra 142gtl in my grandfather's basement that has been resting for many years. I decided to test it and it powers up fine. At first, the s-meter was stuck, but it has freed itself. I can tell that it is receiving because the s-meter is moving all over the place, however, I am not getting any sound out of it no matter what I do. Any advice is appreciated.