Nice video. I fired up a HP 181a yesterday for the first time in 10 years. It doesn't have a variable persistent display like yours and the internal construction seems much older. I read that the 180 series first came out in the early 1960s as the very first all semiconductor scope from HP. It was sold at least till the 70s. I am sure they updated the internals many times during that time.
I'm just checking that I wrote a comment but didn't send it 🤪 I don't even know this HP model, but I've always liked the Tek plugins for their combo capabilities, that analog memory is awesome - congrats on the catch. HP production is visible on every centimeter, you don't even have to see the brand and you can tell by the internal construction - at least with this old school.
@@TeardownOZ2CPU Yes, that's why I wrote that the analog memory is amazing, I've never come into contact with it and I couldn't believe my eyes when you showed me how it works.
@@Edisson. they actually also used this analog storage technology in a non visible storage unint, just cant figure out what it was called, image can be read back using a camera tube / CRT combo
@@TeardownOZ2CPU I've probably seen analog memory once in my life, but at the time I didn't know it was her, the way I think about it, I guess so. In the labs, we had a special oscilloscope for measuring super short times, it was almost a single-purpose device where entire printed circuits were inserted directly into a special shielded slot in the panel. I only know the classics from Tek, because I had a memory oscilloscope (I can't remember exactly the type 4 something) 2x150MHz with a wart - so I called a multimeter above the panel and I'm not entirely sure either, but it had a delay line made with a coiled cable - we had several different types and from there my love for the Teks.
