I bought a new little 19” b&w tv back in march 76. It had the remote ‘thumb clicker’ channel changer. Worked fine for about 2 1/2 yrs. Was married by then, and when my young wife was watching it, she was constantly checking other channels at commercial break. Soon you had to use two thumbs to make it click fast and work. I think I recall taking it apart and not being able to fix it. By fall 82 the tube was gone, and wasn’t replaced. Found out how interesting reading was all over again.