Safety of Older Electronics

Replaced that relay in the SX 737. All went well and no more banging sounds just nice clicks. And it sounds better too.

Thanks for an interesting thread, also for a non-engineer.
Kijanki, the 10degC rule, what is the starting point, the “normal” temperature in the box? I have ca 20degC in my listening room, but the temperature inside the audio boxes varies from very hot esp tubed equipment, to medium hot to quite cold just a bit above 20degC. If the rule is true – hot-running boxes should be serviced quite often! Is there a typical failure time for electrolytic caps (Williewonka) for each given temperature in the box? Also, I did not know about the use factor, that it works positively over time (Czarivey).
Since the thread concerns how to minimize wear and tear and aging, it is of general interest, not just for vintage owners. I started a “total cost of ownership” thread some while ago here on Audiogon, check it up – this relates to the same theme.
So ideally, the user could check the temperature within the box, input yearly “on” time (or total use hours), and know when it is time for service, and what components should be replaced?

O_holter, if you work daily or working out, you will feel substantially different than if you're daily watching TV and sitting in front of PC.
It speaks for itself.
Cliche!

Sorry what do you mean?

I got it...I agree, I knew about the rule that it needs to be turned on, and do work, in periods - and not left stone cold. This is in tune with my own experience over the years - it is after longer periods of being off, that mid-age equipment is likely to fail. Having not being used for a longer period.