My BTI LK-2000 runs a 3-1000z. The date code on the tube puts the manufacture date at 1980. The tube is putting out 1500w on 20m with 125w of drive. Question: What is the life expectancy of a 3-1000z? Ted/WA2MGB --- StripMime Report -- processed MIME parts --- multipart/related multipart/alternative text/plain (text body -- kept) text/html image/gif image/jpeg ---