However these early Tek DSO's are a good first stepping stone into modern DSO's where beyond basic usage the UI is far more complex and as sparky480 is in the land of great choice of SH equipment any would be a good stop gap DSO and likely return their investment when it comes time to upgrade.
Early DSOs are horrible, much less usable than equivalent vintage analogue scopes. It is only in the past few years that cheap DSOs have become suitable for general purpose use.
Some Tek DSOs have completely inadequate trace length, and don't have the "delayed timebase" present on analogue scopes. Hence you can't zoom in on fine details that occur long after the trigger.
On fairness, many cheap analog 'scopes don't have that facility, either.
I wouldn't buy an analog 'scope without "delayed timebase" to use for serious work, as once having used it, I always feel "bereft" if using a 'scope without it.
Luckily, my Tek 7613 is still hanging in there!
Some Tek DSOs use CCDs to capture the signal. That means you cannot observe signals faster than the sampling rate, and so completely miss fast noise on a slow signal. Modern DSOs avoid that to some extent by displaying the mean and peak signal at each display point.
Most of my experience with DSOs was with the very early ones.
Tek & HP would come in to demonstrate them, we would try to look at analog video signals with them & give them the "thumbs down".
The very early ones couldn't even reproduce line rate signals, & even some years later, were incapable of dsplaying video at field rate.
This was because of the very small memory.
If you went to quite slow time / div settings, the sample rate dropped, so as to keep the number of samples low enough to store in it.
This reduced the sample rate below the higher video frequency components.of the video signal, resulting in alasing.