A while ago, I worked on a 2465B which behaved funnily. Turned out several of these "stab" connectors were missing the tiny spring in the square bushings, resulting in intermittent contact. Raymond

Nifty stuff. Raymond

It’s the latest thing in the world of ceramic grease. Raymond

You may start by checking the correct functioning of the sweep magnification (key). Raymond

This reminded me of the ancient but quite nice Philips PM3320A/3323A/3340A digital sampling 'scopes: They have separate adjustments to suppress excursions of the trace beyond defined left, right, top

Of course, the pointing-out-where wasn't aimed at you, Albert but to the OP, although I directed the post at you. Raymond

The associated circuitry is in location B-3 on dwg 13. Raymond

Albert, It's the GSF (Good Signal Flip-flop) trimmer (U102) on the Z-axis board (dwg 13). See description of Digitiser Control Logic > Bus Control > Internal Acquire Mode, page 2-61 in my manual (070-

I'd expect what you mention, Albert, but I have to confess that one of my 7854's was exhibiting the exact same behaviour when I first got it and I'm sure slightly adjusting one of the pots on the Z-ax

At the beginning of your video, the retrace is quite visible as the low-frequency waveform. Subsequent acquisitions show artefacts caused by the fact that the digitisation system wasn't designed to sh

The "low frequency" that you see is actually the retrace (return of beam to left of screen). Have a look where it "ends" at the right side of the screen: Always where the real trace stops, so it's act

This is getting embarrassing, although it's only 2:00 AM where I live: Correction of my correction a few moments ago: It should read "The rim of the sockets on one of my 454's is marked "Sealectro" an

Correction: The rim of the sockets on one of my 454's is marked "Sealectro" and "950-0019-86", *not* "950-0019-86". Raymond

The rim of the sockets on one of my 454's is marked "Sealectro" and "950-0019-00". I'm pretty sure it is *not* (compatible with) a Lemo connector: The "Sealectro" has an internal "shim" that the Lemo

I have 454 manual document 070-0617-00. The power sockets are 2 pieces 131-0438-00, shown as part 84 in fig. 1, "Front". The parts list shows them as "CONNECTOR, 3 contact, female". In the schematic d

Hadn't seen this document, Kurt. Thanks! Raymond

Both Q384 (NPN Darlington) and Q386 (PNP Darlington) definitely should *not* be shorted to the chassis, as is clear from the Step Amplifier schematics. Common of the floating supply ("-52V") is shorte

What follows is a longish and sad story. A few days ago, I was contacted by someone who said he was looking for a good quality analog 'scope. Without asking many questions, I showed him one of my 465'

The P6139A was designed for the 500 MHz TDS-series (TDS500 e.a.). The P6137 was designed for the 2465B. Raymond

Keep spreading your knowledge, Dennis and don't police yourself! Raymond