Found vintage #Tektronix sampling oscilloscope online with 20 GHz sampling + TDR modules installed at a great price. 🤓 But the screen in the photo actually displays a self-test failure Can either be a module fault (replaceable) or a mainframe fault (can be impossible to fix), let's see if I can convince the seller to do some tests... #electronics

Sent a message to the seller. I was told the machine was already sold since a long time ago

Continue my hunt of old test equipment above 1 GHz. Last week I ordered a similar Tektronix sampling oscilloscope from another seller, but it's still not shipped yet. I'm not sure whether the vendor wants to sell it at this point... Finding a cheap one is the exception rather than the rule (*), but I'll continue searching for them... #electronics

(*) unless you live in the Silicon Valley or near the MIT, both locations have the biggest electronic flea markets in the U.S., you can find a lot of unusual equipment there...

Ha, the scope seller said they are on a business trip and will take a look of the scope for me later. Good news. #electronics

Sad ending. The vendor said the oscilloscope I wanted was listed online for a long time without any buyer, so it has already been completely dismantled by the company for parts. RIP, scope. Tektronix CSA803 & 11801 were the best engineered sampling oscilloscopes from the early 1990s. #electronics

Found another #Tektronix 11801 mainframe. I hope I get better luck this time. #electronics