Charles1dad 10-28-2016I suspect a relevant factor is that both you and the reviewer use amps that are biased in class A, since both amps are SETs, and therefore the amount of current drawn through their mains fuses remains essentially constant and independent of the dynamics of the music. It might be a different story with amps that are biased in class AB most or all of the time, and especially in the case of class D amps, where the AC current draw fluctuates dramatically with the dynamics of the music. Which would result in rapid fluctuations in the resistance and perhaps other parameters of the mains fuse.
His [the reviewer's] finding the source components more demonstrative of the Black fuse than the power amplifier matches my outcome. No doubt that this is very likely brand and/or component dependent.
Also, the generally much higher current ratings of fuses that are used in power amps and integrated amps, relative to those used in upstream components, and perhaps differences in designer preferences with respect to how much margin is provided between fuse ratings and actual current draws, could conceivably be factors that are involved. I note that both the reviewer's amp and yours are made by Coincident.
As you said, "no doubt that this is very likely brand and/or component dependent."
Best regards,
-- Al