Happiness is as easy as a power supply with 12 filtered and isolated outputs.
Replacing the power supply is a game changer ! No more hum or noise, no hiss and all effects are less sensitive to powerlines or radiowaves "pollution".
In my home studio, this is true happiness ! I stopped spending too much time on struggling againsts noises and hums. I can focus on the music, not the technic. During the mixdown, there is no more need to clean a track using a print filter.
For time being, I have nerve tested it in live situation. However, during rehearsals, my sound is clean and neat like a baby.
Conclusion: for less than 100€, you have a reliable power supply, with isolated and filtered outputs (a miracle in this price range) and it changes everyting.
And this little wonder can power up to 27W in output !!