johnjen
Headphoneus Supremus
Yes typically things go boom during turn on. The inrush current is many more times the continual current draw while operating, thus why I seldom turn the entire system off. Yes it can cause more 'wear and tear' especially on the electrolytic caps, but this is a trade off I am willing to make to attain a greater degree of SQ. And there are ways of mitigating these thermal consequences as well.Like you..I normally leave my system on 24/7. Its bad weather that I turn it off for.
When asked.. NuPrime /NuForce recommends waiting twenty minutes to reach operational temperature (after the unit has already been burned in). As long as the AC line is well protected its ok to leave on 24/7. There will be less turn on surges that way. Even Asus told me for my monitor its better to allow to go into idle rather than turning on and off, because the turn on surges will wear out things quicker than constantly on...
That is why we see 'slow blow' fuses. Slow blow is designed to absorb the turn on current surge, and not blow. As for fast blow? Not sure what's going on there. I guess its what the transformer demands of the AC when first turned on.
If you have ever investigated the response curves for fuses, a good portion of your answer about slow-blow vs fast-blow will be found there.
Also look at the the I2t rating which is partially described as, "Nominal melting I2t is a measure of the energy required to melt the fusing element and is expressed as “Ampere Squared Seconds” (A2 Sec.). This nominal melting I2t, and the energy it represents (within a time duration of 8 milliseconds [0.008 second] or less…"
(from the Littelfuse catalog).
JJ