03-31-2018 Post does not mapped to Knowledge Tree Romy the Cat Boston, MA Posts 10,166 Joined on 05-28-2004 Post #: 81 Post ID: 24774 Reply to: 24773 This is normal A ringing during warming up he is a typical behavior when a driver tube begin to age up. Replace it.  "I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

03-31-2018 Post does not mapped to Knowledge Tree decoud United Kingdom Posts 247 Joined on 03-01-2008 Post #: 82 Post ID: 24775 Reply to: 24774 Solved Many thanks, Romy: all is now well.