I have a Tektronix "OPERATORS' MANUAL" for "CATHODE-RAY OSCILLOSCOPES TYPE 535 AND 545" (those are quotes from the front cover) which says it "applies to standard Type 535 Oscilloscopes having serial numbers between 6045 and 7552, to rack-mounted Type 535 Oscilloscopes having serial numbers 4048 and 4072, to standard Type 545 Oscilloscopes having serial numbers between 5946 and 7400, and to rack-mounted Type 545 Oscilloscopes having serial numbers between 1740 and 1775". (I suspect there is a "between" missing before "4048".) It is a small 45-page booklet and is definitely a user's manual; it is not a repair document, not even what tony calls a boardswapper guide. It apparently got wet at some point in its history; the first and last few pages are stained green, presumably from the covers (which are green). (Not stained to the point of illegibility.) I do not have any device it applies to, do not really expect to, and am inclined to doubt I would need it even if I did, so I would cheerfully pass it along to someone who actually wants it. It's currently in Ottawa (Ontario, Canada); I could pop it in the post easily enough. Anyone? /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B