The attenuators can get glitchy with age. You should be able to clean them, they're quite serviceable. See this photo album for some pictures of the attenuators from my 2430: https://groups.io/g/TekSc

Hey Grayson, It'd be helpful if you could describe what you've done and seen in some detail. Detailed observations are vastly more likely to produce useful advice than writing up your conclusions. Inl

If you're seeing this only for the sweep speed, but consistently for *all sweep speeds* *and for the cursors*, then possibly your horizontal gain has drifted. What's more likely happening is that your

Note that Shapeways uses an SLS process which produces parts with great strength and very good dimensional accuracy. This may or may not matter for your part(s) but the quality and strength and flexib

I hear you, although I seem to remember you can use other authentication providers to log in to ShapeWays. Maybe that'll work for you. I don't think they charge anything extra for one-offs, as their p

These are tiny parts and I feel the price for each is quite ... exorbitant ... especially once you add shipping to the frozen tundra where I live - Canada. The/a/one problem is that there's a fixed co

I modeled these up and put them on Shapeways, and I understand some people have had success with those. You can buy prints, or you can download the models and print them yourself. Here are the links,

wrote: Thanks, that does work. I was looking for a video link in the thread and I totally missed the file upload notification. The video is pretty grainy, and recording the CRT tends to blow out the t

wrote: I'd love to see that video, if only for reference to my 2467.

The readout looks to be working as intended to my eye, the problem is the intensity control. The 12 o'clock position is where the readout is off, clockwise from there you get the scale factors etc, wh

Some links for those who're tempted to look: https://w140.com/tekwiki/wiki/Tunnel_diodes, https://w140.com/nasa_paull_tunnel_diode_logic.pdf. wrote:

Þann fös., 21. maí 2021 kl. 06:45 skrifaði SCMenasian <scm@...>: You’re talking about the regulated 5V rail, but the load goes across the 5VD. This supply is regulated through the inverter,

I believe VQOUT is the automatic focus control out of the Z-Axis hybrid (U950).

That's ingenious, using the scope as a delay pulse generator.

Þann þri., 4. maí 2021 kl. 20:02 skrifaði Dennis Tillman W7pF < dennis@...>: They print them off in some kind of nylon IIRC and ship them to you. Do you get a royalty for each one they sell?

Hey David, I paid $90 plus shipping for mine back in 2015. It had some problems, notably the brackets that hold the PCB straight for the edge connector were broken. I drafted this replacement https://

wrote: That's unfortunate. Excellent sleuthing though!

Switchers will run just fine on DC input, and if you have a suitable bench supply to run it from, that gives you two big benefits: 1. Limited energy input, the current limit could be set low enough th

Good luck. I seem to remember someone sketching the schematic of these attenuators, where this resistor was in-line with the signal. Presumably it's for dampening and/or a fusible cutout, and so the p

Hey Rich, Matt D'Asaro fixed at least one attenuator in a TDS-420 that was similarly bad. The article is here: https://www.antiqueradios.com/forums/viewtopic.php?t=216792. The images don't load for me