fuse damage

Not to beat a dead horse but HiFi Tuning has been around longer than dirt and as far as I know is the only aftermarket fuse manufacturer to have their fuses tested by a third party and actually publish those test results on their web site. The tests included HiFi Tuning fuses of various types, other manufactures’ fuses, measurements of fuses in both directions and measurements of fuses with and without cryogenic treatment.

That's actually second hand information.  The witness is not here to cross examine.

I'm not accusing anyone of lying.  You cannot find out what really happened unless you do some digging.  It could be for example that the amp owner installed a wrong value fuse in one or more locations.  It wouldn't be the first time.  There is also the possibility that the manufacturer has it in for aftermarket fuses.  Difficult to say without actually well, being there. It's a lot of who shot John at this point.

The following are Roger Modjeski quotes from that bastion of audiophile wisdom, Audio Circle.  

Roger Modjeski wrote,

"Perhaps you are recalling my post about burn-in where I questioned: If burn in is real, how come it wasn't discovered in the 1950s? I can only suggest that people weren't searching so hard to make something out of nothing. I recall Enid Lumely and her little tweaks, one of which was to put the cable against the wall and then put pine boards angled at 45 degrees to cover them. The good thing about people like that is they eventually go away. However if they start to make money from it, that takes longer."

"I am constantly amazed at the willingness of some to try a modification (tweak) that cannot possibly work. That is the whole point of this post. A fuse cannot be microphonic no more than pigs can fly."

"It is a thankless effort (perhaps a fools errand) to explain the science of things to un-scientific people. Yet these people should realize that the best products come from good science. I would not be able to design good sounding equipment using the pseudo science that is bandied about in the industry. Has anyone noticed that the makers of these modifications (previously called tweaks) for the most part make no real products. They do not know how to make an amplifier and many of them cannot even explain how one works yet they feel they can make it better with their "discovery"."

The Roger Modjeski quote in which he explains what he means by the term, High Breaking, which apparently is the issue he is all hung up on.  Now, please correct me if I'm wrong but wouldn't his definition mean he has heartburn about ALL GLASS FUSES including stock fuses or ANY fuse that's not filled with sand?  HEL-loo!

"I have previously defined these terms, however I will again as those posts have been Quarantined. We currently have more posts in the hospital than any other forum.

You are correct, the fuse must not allow plasma to form. It is therefore filled with sand or some other material to fill the space when the fuse element vaporizes. It is not so much about voltage rating. I think 32 volt fuses are made differently from 125 volt fuses so as to have less loss at low voltages as they typically have elements that are wide at the ends and narrow in the center thus reducing resistance which is important in a low voltage circuit. Given that I feel 32 volt fuses would be a good choice for speaker fuses where high breaking is not an issue at all.

I get more questions about the voltage ratings on fuses than any other parameter. In actuality it is the least important parameter.

The responses from vendors and manufacturers have displayed no knowledge of these requirements at all. The respondents have missed the target entirely."

More Roger Modjeski quotes on Audio Circle, from a thread on aftermarket fuses.

1. "Quote from: *Scotty* on 14 Jul 2014, 05:29 pm
Did you also test them for suitability as AC mains fuses or speaker fuses?
Scotty

I did not. I have done all I can to inform the public that they are not suitable for tube fuses and that their claims as to microphonics and improved electrical performance are specious. I have no interest to do further tests unless they want to engage my services as a consultant."

2. "There are very few instances when a fuse is right in the signal path. If people hear a difference there I am fine with it and it is explainable. The bulk of these fuses are used in power line and tube fuse applicators where I cannot imagine them making any difference. I would like to hear your thoughts on those applications."

3. "Most likely a design choice for short circuit protection because electronic protection (current limiting) is often a problem with difficult loads. As long as the output devices are protected from shorts I prefer a fuse to current limiting. If it has any effect it is far less than current limiting. It takes twice as many fuses to put them in the power rails outside the signal path, but that is a good place to put them.

The one place a fuse might be audible is in the speaker output. This is widely known and perhaps the reason that premium fuses got a foothold in other applications. It is typical of people with limited knowledge to paint something with a broad brush or generalize. In this case since a fuse in a speaker might be audible then fuses in all applications might be audible. With proper knowledge of the situation one can be more specific."