I have around 20 of these scopes, because they are very special to me and do things that modern scopes can not do.
What are the things that modern scopes can not do? This may convince me to keep this unit, although i am in dire need of money
1. You can put 5000V DC on the input front end and the scope will survive
Try that on any modern scope.
I am using these scope more or less exclusively for high voltage measurements.
And if something goes wrong, they will just NOT die from it.
2. Math Integration with noisy signals.
You have real time power of two signals (Multiply voltage and current) on the screen
And at the same time integration to get the energy.
All modern digital scopes that I tried have problems when the high voltage signals
are full of noise.
3. Store all recall 4 signals at the same time
Try this on a modern scope:
You have 4 signals and you want to store them in the background as a reference
And then you can visually compare signals to these 4 reference lines
This PM3394B does this on a fly.
4. Average button
I am looking at many signals that I want maybe a single or average mode
Here I have one button to bring all 4 channels in to AVG or SINGLE mode acquisition
I have many modern Keysight scopes as well, up to 6000X series
But for many measurements I prefer the PM3394B
Of course, there are situations where modern scope outperform these old Philips scopes
But for some special applications they can not be replaced.