Will there be any 'Arrow' mark in a Fuse holder?

Rhapsodi -- As you can gather from the preceding responses, whether or not the orientation of audiophile-oriented replacement fuses is sonically significant is a matter of, um, some controversy. Whatever the case may be, though, the statement you quoted is complete nonsense. You will not damage your equipment if the fuse is installed in the "wrong" direction.

Why not try it both ways yourself, and report your findings as to any sonic differences you may perceive?

Of course, for your assessment to be meaningful you'll have to be careful to allow enough time for the equipment to warm up properly following being shut down for the fuse reversal, while not allowing so much time that extraneous variables may come into play. Such as changes in ac line voltage or ac line noise conditions; changes in room temperature; changes in ambient emi/rfi conditions (perhaps caused by digital equipment elsewhere in the house being turned on or off); differences in volume control settings; on-going burn-in or aging of system components; the vagaries of aural recollection; the fact that additional detail may be perceived upon a subsequent listening to given source material that was not perceived during a previous listening, even when nothing has changed, etc., etc.

Best regards,
-- Al

Sid, my feeling is that a blind test would be unlikely to accomplish anything.

Most blind tests that have been reported in the past, involving things that would seem more likely to make a perceivable difference than fuse orientation (such as cables and even amplifiers), have resulted in a finding that no differences were perceivable.

Assuming that would be the outcome, the believers would allege that the skeptics did not hear a difference because of negative placebo effect (i.e., they did not expect to hear a difference so they did not). They would also claim, perhaps with some legitimacy, that they themselves did not hear a difference due to lack of familiarity with the sound of the system, or due to listener fatigue that might develop during the course of the tests, or due to other aspects of the test conditions.

Also, I would not characterize conducting such a test as "easy." Eliminating the possibility of differences being caused by extraneous variables, such as the ones I mentioned in my earlier post, would require very careful control of a lot of things. And at least several test subjects would have to be involved, to eliminate the possibility that the test result might be the result of guesswork (while not requiring any individual listener to go through an unreasonable number of trials, that might lead to listener fatigue). The inclusion of several test subjects again raising the issue of lack of adequate familiarity with the sound of the system.

Sebrof, yes we are talking about the ac mains fuse on the component. My suggestion would be that if you think you hear a difference, go back and forth a couple of times to confirm (allowing a few minutes for warmup between each reversal).

Best regards,
-- Al