Hi Steve, Ijust purchased the ZH1 used on EBAY from a original owner. As I write this the battery He sent it with just died and I just replaced it. The unit was kept in great condition with roughly 150 hrs burn in time, the last 2 days I noticed some crackling or loss in the left channel when My cable moved in a certain direction. I use a 1/4 to mini Grado adapter, could the battery losing juice be the culprit or a problem with the phone jack?   Thank You for the Time, Sincerely, Frank.