On a sunny day (Thu, 23 May 2019 22:19:01 -0700 (PDT)) it happened snipped-for-privacy@gmail.com wrote in :
... snip...
Scopes ANALOG scopes I have used to repair maybe a few thousand TV sets, VCRs, what have you, studio equipment like quadruplex recorders, cameras, no end to it, system converters, and I still have my Trio 10MHz dual channel TV repair scope as main scope and it still works after 2019 - 1979 = 40 years! ONE repair job when I accidently touched a booster output (few kV) with the probe, and few years ago the soldering station dropped from the table on it and cracked the graticule, so I made a new graticule. Quality!
Before that I first build a tube one with DG7-32 CRT early sixties, mostly from some circuit I found in some magazine. the second one was my own design (1968 or so) and used RTL logic, the same CRT, had triggering, and the third one was later, a 300 MHz bandwidth with an East German CRT and based on a Tek circuit they accidently published in some magazine. Talked to that guy later at Tek, he had a lot of headwind because he publised that, he told me. Then I moved to on other place an donated the whole stuff..
So, now, and yesterday after reading all this, I checked ebay for CRTs, found even my old DG7-32, many different Russian CRTs, so there is noting in the world here why you cannot build a fast analog scope as to 2019!!!
It is : The player, NOT the instrument. That is why I still have not bothered to buy boat anchors and Rigols and what have you, a new digital one appears every year from China. Important is that you understand the circuit, understand how the scope works and what it really shows. Maybe a wet finger can then replace many thousand of dollars of equipments, a clue will do, I agree with Joerg, I use my SSB radio a lot... for precision things like locking to rubidium reference check etc, Some people stuff their 'lab' full of multi million dollar impressive looking stuff. But a clue, just ONE clue, is a lot cheaper. And in broadcasting it was always the result that counted, the show must go on, freaked out directors and artists is a heavy load if a camera or recorder breaks down, transmitting 'black' is a nono, find a way. I have done that for many years, and always the show went on. Clues and in depth knowledge of the equipment you are facing is essential for fault finding. So is improvisation if under pressure. Just wanted to say that, most people work without a minutes timeline. And 'tronix is simple!