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CILs can be very helpful! They help prevent switches from being damaged during turn-on as well as other parts.
They were not always available, so on older units of 40-50 years and more you won't see them. But on newer units the designer is missing a bet if he does not use them, no matter how famous they are.
CILs have different ratings, so the proper device should be used in each case. As long as that is observed, their use is simply good practice.
Not necessary at all. The D90/D115 do not need an inrush limiter. They have line fuses....The D90 originally had a relay and in some instances proved to be a problem. I have removed them with no ill effects. Both the D90 and the D115 use a tube voltage regulator that does provide the high voltage with a bit of a delay on turn on, until the tube starts to conduct. The D115 already has a relay and a thermistor to allow the caps to charge up and therefore it's not needed. Regarding the H/K I don't know the circuit. Which D90 do you have, the B version or the plain?
Hifigeek1, nearly every amplifier has line fuses. A current inrush limiter will have a high value at turn-on, but a negligible value under normal load. This prevents damage to switch contacts, rectifiers and the like.
The 'thermistor' you refer to BTW is probably a CIL- CILs are a form of thermistor with an inverse temperature coefficient.
The HK Citation II is an excellent candidate for a CIL addition, as it has a large current inrush due to its voltage-doubler power supply. The filter caps are taking a lot of current at turn-on and will thus last longer.