Synergistic Red Fuse ...

Al, your silence is deafening, are you getting splinters?

Hi George,

At this point a multitude of opinions and experiences have been stated that are relevant to choosing the current rating of an SR fuse, including opinions from technically knowledgeable people such as you and I. Those reading the thread who intend to try SR fuses can and will form their own decisions as to how to proceed.

For those who may be pondering this question, though, I'll add the following question and answer to my previous comments on the matter:

Question: Are the protection characteristics of a stock 5 amp fuse, especially the combinations of current and time that would cause it to blow, most closely approximated by an SR Black 5 amp fuse, or by an SR Black 6.3 amp fuse, or by some other SR Black fuse?

Answer: We don't know.

Best regards,
-- Al
 

You need to answer this question Al, for safety sake, as many here hang on your words.

Are you or are you not advocating that anyone else replace a manufacturers given fuse value with something higher, especially if they have no technical background, so they can monitor any problems like you can

Cheers George

Hi George,

The point to the Q&A in my previous post is that we don’t even know if an SR Black 5 amp fuse should truly be considered to be a 5 amp fuse, as opposed to a 4 amp fuse or something even lower. And the reports we’ve seen from a number of people of blown SR fuses would seem to suggest that one of the latter possibilities could very well be the case, for many if not most or all ratings. Also, fuse derating (the margin between the current rating a designer has chosen for a fuse and the amount of current it conducts under normal conditions) is not a precise science, with designer preferences, the limited number of choices that are imposed by standard rating values, and turn-on inrush currents and other characteristics of the particular design all factoring into it.

So my basic intention is to provide food for thought, rather than advocacy. Although per my various posts on the subject I would not consider it to be an unreasonable course of action for someone who wants to try SR fuses to choose values that are one or even two increments higher than stock, and in the end perhaps avoid wasting several hundred dollars as a result. I respect the fact that your opinion differs, and as I said earlier, given the lack of meaningful technical data on the SR fuses I don’t think anyone can provide an answer to this question with certainty.

Regards,
-- Al

So my basic intention is to provide food for thought, rather than advocacy

So your not advocating, increasing the fuse amperage from the manufacturers specified value/s.

This is good Al, for the sake of safety.
As most here don't know if they're changing an ac mains fuse, dc rail fuse or speaker protection fuse. Maybe we've saved a future life, or at least a piece of equipment.

Cheers George 

almarg: "So my basic intention is to provide food for thought, rather than advocacy. Although per my various posts on the subject I would not consider it to be an unreasonable course of action for someone who wants to try SR fuses to choose values that are one or even two increments higher than stock, and in the end perhaps avoid wasting several hundred dollars as a result."

Reads quite differently when not taken out of context, eh, Mighty Mouse?

Ain’t it a pisser when real technical experts like Al refuse to take your bait?

Dave