Thanks for your fast response it's about the NAD C370 speaker protection replay https://www.norwegiancreations.com/...ier-the-slow-start-protection-module-problem/I'm not sure I understand exactly what you mean but I'll try to answer based on what I think you are asking.
The ageing process of capacitors is largely based on a combination of heat exposure and time.
In the datasheet for a typical capacitor, the life expectancy will usually be cited as 'x' hours at 'y' degrees (F or C).
For larger power supply capacitors, the ripple currents will also need to be taken into consideration.
Therefore, in the same circuit (or rather on the same PCB), different capacitors will likely have differing lifespans, depending on exposure to heat and ripple effects, voltage across it etc.
Depending on the location of the capacitors in a circuit, there can be quite some considerable deterioration before it becomes audible.
A relay on the other hand, can last forever - but - relay contacts are typically destroyed by the interruption of a large current which will cause arcing on the contact surfaces, which in turn increases the contact resistance which in the case of an amplifier protection relay, will introduce distortion.
Worst case scenario is that the relay contacts can actually weld themselves together which of course then defeats the object of having one in the first place!
The capacitors are losing their value eventualy because of the wrong placed zenner diod whiche causes a delay time in starting up. But if that is all you can wait for several minuts an it will eventulay start up so no need tot replace those dried out capasitors. I can't image that eventulay this Will have no consequenses.
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