I'm the guy who posted the boot process on YouTube. Sadly I have little more to add to the discussion, since I sold the 3002 years ago. I can confirm that it was loud, yes. Though it had a lot of clev

I've just tried to use my 7104 for the first time in a few months. It's been stored in the attic of my house for that time. When put away, it was working really well. It still seems to be working well

This also works with dual-timebase 500 series tube scopes and a bit of wiring of one sweep output to the Y axis. Neat trick. I eatablished a couple of years ago that it can be extended to serial digit

Mouser seem to do M3.5 spacers and standoffs in a variety of sizes: https://www.mouser.co.uk/c/electromechanical/hardware/standoffs-spacers/?thread%20size=M3.5%20x%200.6 which should do the job. Incid

I've got various touch screen technologies on the workbench so can directly compare them. My modern PC and phone have capacitive touchscreens, and we're mostly familiar with how they behave: sensitive

Bear in mind also that the frequency measurement on a 2430A isn't very good. It's done using maths on the sampled data and is nowhere near as accurate as a proper frequency counter. I wouldn't trust i

I'm pretty sure the calibration procedure is the same for both versions. I've used both, and they're sufficiently similar that information about one is likely to be useful to the other. Chris

I recalibrated the my 2430A after replacing the non-volatile RAM chips and recorded the process on YouTube. First, the powerup after replacing the chips takes a long time and shows an NVRAM checksum e

My 2430A is one of those. The batteries in the Dallas modules gave up a few years ago so I first lost trace storage and then the calibration data. I replaced both RAMs with Cypress FRAMs (ferroelectri

I see the same effect with my 7D15 in my 7904A. It's to do with the character generator in the 7904A. It can only generate a certain (small) number of points per character, and drawing an '8' smoothly

They can be surprisingly tough. I bought my 7904A mainframe from eBay in the US for an absurdly low price because it had no plugins. It came via the eBay shipping program and arrived here in Poland in

OK, just tried this and I can get a similar result. Both A and B timebase buttons pressed, intensity cranked up, I get a fair glow on the whole screen, with normal readout (though more flickery than u

Looks like both A and B timebase buttons are pushed in, which is an invalid combination, and the intensity is cranked up to maximum so the screen illumination is probably just a very intense spot some

Yes, they're really handy. I use them for all sorts of odd jobs that don't fit in to a microcontroller or FPGA, like signal conditioning or taking signals in to odd power domains. Chris

yahoo.com@groups.io> wrote: Yes, except for very specialist replacement applications. The speed of CMOS logic caught up with ECL and overtook it, and in any case discrete gates are hardly ever used th

Why is the rotation necessary? The CRT monitor is mounted rotated anyway, isn't it, so the "vertical" scan is actually left to right, same as on your replacement LCD. Chris

That looks really nice, great job. How does it work? What's going on in the FPGA? Are the horizontal and vertical frequencies standard? How have you handled the touch screen? On mine the plastic is cu

No, sorry, they don't. This is a common misconception. UV LEDs exist but are far too expensive and inefficient for this application. White LEDs, and some others of unusual colours (pink ones appear in

That's the logo of Livingston Hire, I think, who were the original importers and distributors of Tektronix equipment in the UK before Tektronix got their own operation in Guernsey under way. That's ho

The naked CRT in the foreground looks very much like a VCR97 to me. That was the CRT developed for WWII airborne radar and navigation applications and it was available at low cost in large quantities