Hi,
Here is a "new" Tektronix 316 Oscilloscope
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
It was dead on arrival, of course, and was quite dusty. I washed it in the bathroom and let it dry for 10 days.
I started by checking the power supply : almost all electrolytics in this section were bad. Once replaced I did obtain a spot in X-Y mode ! Better : by using the calibrator output, the spot moved in both directions.
Schematics found online are not for my old unit : Tektronix made a lot of changes. I was fooled thinking that even if the tubes was not the same, waveforms should be similar... Eventually the 317 schematics showed me that the waveforms I have in my instrument are perfectly OK with this tube set.
Focusing on the time base, I noticed corroded legs on two NE2 neon bulbs. These are hard to find but they are said to be replaceable by a 82 volts Zener. I used 3 22v and 1 18v in series to obtain an approximate value. And the time base started to work again !
Next will be to take a look in the trigger section : in many time/div positions there are multiple traces on the screen, and they are not triggered at the same point.
Also some black beauty to replace but as it now kinda works il will be easier to do it a step at a time.
Thomas