Arg, Chan A on mine just died. If you don't know what these are, they are a real gem, far better than HP ever marketed them to be. Geller Labs did a writeup back in 2019, but my link doesn't work anymore. 14 digits of frequency precision possible, sub-nanosecond rise-time measurements, etc. without all the horrible analog tweaking the classic HP 5370 required. Trivial calibration procedure. Anyway, two actual comments - anyone know of common failure modes? Mine is clearly on the input channel analog side, the led for signal doesn't blink. Fortunately, I have a spare unit, but I'd like to fix this one. I do have the CLIP for it. Second comment, wow, prices have gone insane on EPray! Why? I have 3 of these, 2 with the 2.5Ghz mixer and one without. I got all of them for a couple of hundred bucks some few years ago. Bill -- Bill Ezell ---------- You keep using that word. I do not think it means what you think it means.