I have two 4-1000A's. One new , one used with only a few hours of light duty on it. Check out the pictures of the tubes plus a few other parts , you will see they are clean , no burn marks on the used one. If you want one let me know before I put them on EBay. Reach me off list at RDJS at wildblue.net Pictures at http://www.flickr.com/photos/kd0zz/ Rich , Kd0zz