@grizewald: thanks for the photos. Looks quite pleasant to work on. Are those trimmers Piher ones? I've seen furry Piher ones before. Not sure what does it. Tek headers do it as well.
Pleasure! It's certainly not cramped in there, that's for sure. The service manual includes a component map to make up for the lack of silk screen, so it shouldn't be too hard to fix things.
I'm not quite sure of the brand for the trimmers. Some still have the original black colour, and some have gone grey and furry. Never seen that before. I wonder what chemical process is at work there?
It also seems that any time faster than 50μs/div stops the trace, so it looks like there's either a dead cap or a bad connection somewhere. Otherwise, it seems quite stable, apart from the A channel vertical position.
First task is printing a graticule holder to fit on the metal pegs around the screen and then get a 10 x 8 graticule printed.
It does a nice job of displaying an AM signal, and it confuses the sensor on my phone's camera very nicely! I can assure you that the trace is nicely green in reality with just an intensity difference at the zero modulation points.
![](https://filedn.com/lEDSGUXnO7mp9lWR3BbARrR/Scopex/IMG_20200207_185756.jpg)