I have had my K1 #1734 in use occaisionally since I built it. The other day I noticed quite abit of drift,even after warm up,like 1-2 khz. over an hour or so.I think I remember it was going lower in freq. I just wondered if anyother owners have had a similar problem? Could be from day one and I just now noticed it! Can't really say, Thanks John KF7OM