i disagree.companies cut cost everywhere.see the prices from capxone samwa samxon etc.i do repare and i own mainly a lot stuf audio amps processors etc you can see inside of 3-4000 euros device the cheapest crap.this is unacceptable.in most cases 85C temp. all the time found on psu's (any kind of psu's) audio household pc's no more than 7 to 10 years old this crap deformed or leaked.never sean good brand capacitor goes bad that way.i do a lot measurement before and after replace (crap)acitors in relative new devices in most cases the ripple and noise get a lot better.
That is why you took out capacitors that are rated for 105°C? Because some random PCs had bad 85° capacitors 10 years ago?
Also, this power supply is basically a preregulator. Board has dozens of local regulators that
are critical to signal integrity. If anything, those should be made "better". But to do so would need some real engineering, probably a respin of mainboard and would also be a point of diminishing returns, because other types of signal integrity problems would influence signal more (ground paths, crosstalk, shielding..)...
And then you have noisy front-end/ADC on MSO5000 that drowns any other interference in it's own noise floor..
It is basically a audio-foolery type of nonsense. Let's change all the capacitors for most expensive ones because "the more - the betterrer" ((c)AvE)..
Let's see measurements before and after. Then we can see if it was worth it. So many of poor souls that do not have enough knowledge can realize it was a bad idea to disassemble perfectly working instrument (with maybe warranty) and possibly even damage it (Murphy never, ever, sleeps) to gain absolutely nothing. Except hand waving and woodo.
Or maybe it is not woodo. Maybe it was worth doing it. Easy to settle: lets see what oscilloscope measurements got better as opposed to original PSU. Hard numbers. Like: RMS and P-P noise on 4mV/div was xx RMS and xx P-P and now is 1 or 10% better. Or in FFT you can see that spurs at xx MHz are xx dB down ... Those kinds of things.
Or maybe statistical analysis of MTBF and defect rate on these PSU based on full battery of thermal tests in environmental chamber of say sample of 100 ?
Here's one data point for you: there are literally 10s of thousands of those sold and there has been few years now. Not to mention all kinds of similar PSU designs by same manufacturers for other scopes... And you know what ? There has been practically ZERO defects on PSU for reason you stated.
Oh, there were (expensive) Keysight scopes with PSU problem, but even those were not because of capacitors...
Or only metric that it got better is that now you "experience the clarity of waveform presentation with nice and crisp peaks but subdued curvature of low frequency spectra and better defined pixel presentation of fine details..."