why do hi-end fuses keep blowing, while std don't?

Well, if one insists, it would be, scientifically speaking, impossible for a fuse to not modulate the current passing through it.

That’s it’s job. Literally.

And it goes about in a very non-linear odd-ordered distortion pattern way. Where it is a combination of the load vs the physical properties of the fusing element.

Again, that is part of it’s fundamental operation and function.

Modulated current means abnormal amplifier circuit behaviour. It’s like a tap that turns it’s self off a bit when the transient load goes up and then retreats to being more open when the load decreases. But not in perfect agreement with the load, it does it in an odd harmonic, non linear way.

Humans will hear this, as our hearing is designed to hear odd ordered harmonics that are out of ’position’ in time and level.

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This can be expanded on and filled in more correctly or fully, but ...those are the basics.

Anyone looking at fuse element fundamentals and operation, would have a hard time missing this, as it is the core of the fundamentals of the design and operational parameters of a fuse. Writ large across the literature. It’s clearly visible in the loading behaviour graphs.

Missing it means, well, I’m not sure what it says about the given intellect reviewing the data. But it could be stated in a negative manner.

What's the moral to the story? As my old boss at NASA used to tell me, never get behind anyone 100%.

Do an experiment. I did.

For the fun of it and to see what is what..

... I swapped out the emitter resistors on a power amplifier for fuses. the theory being that if the current was too high in the one transistor, the fusing element’s resistive properties would change, or increase..like it is designed to do ---and thus enforce current sharing.  This is a goodly part of what an emitter resistor is supposed to be doing. Enforced current sharing. But, not quite the same....as how a fuse would handle it.

This change (fuses for emitter resistors) would cause the worst elements of what a fuse is - to come to the fore.

Gotta be one of the most horrible sounding amplifiers I’ve ever heard. If not the worst.

If you want to hear what a fuse does, try that.

bdp24 writes:

You’re missing my point, Mr. Kait.

If we could just pin this, maybe next to the Forum link, cut and paste, save an awful lot of time.

Oh, yeah! Like I’m the one missing the point. Break me a give!