In a message dated 6/26/2006 6:53:56 A.M. Eastern Standard Time, Dxhogg at aol.com writes: I have a new al 1200 that I will be putting in line Wednesday . Should I run the tube in a burn in state before applying any drive power. Thanks for any input 73 ray nr1r Ray, What does the manual say, or what does the data say that comes in the tube box? Lou