Timbo expressed precisely :
My question is: can these distribution amplifiers "go wrong"? If so I
obviously need to replace it. I've seen a reference to distribution
amplifiers needing replacing after a storm. Is the a possible cause?

After reading your other submission, it does sound as if the unit has
failed. Certainly they can suffer storm damage (lightning). Even if not
a direct strike, it can damage the front end.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org