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Old 23rd April 2013, 01:49 PM   #1
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Default Fusing and Mains inlet impedance / noise help

I'm experimenting with different case fuses in my ARC LS7 pre and to my surprise replacing the 750mA TD11 fuse with a 10Amp version yields a larger soundstage and a more realistic presentation (to my ears at least)

I'm not prepared to keep using the 10Amp fuse as it's not exactly safe, so what I was thinking was to replace the 750mA fuse with an Airpax circuit breaker...

Does anybody have any experience of swapping fuses for circuit breakers in pre / power amps?

Some preliminary research seems to show that a 'normal' circuit breaker has a much higher impedance than a fuse and should sound worse...however I can now remove the on/off switch so will this result in a net power inlet impedance reduction?

Are thermal breakers better than magnetic?

Many thanks

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Old 23rd April 2013, 02:03 PM   #2
Mooly is offline Mooly  United Kingdom
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Breakers often use both magnetic sensing (for serious sudden overload) and thermal (for long term overload where the overload current may be say 30% over the rating)

You can hear a difference... why not get someone else to swap the fuses for you when you are not in the room and see if you can pick the difference out then

I'm not saying yay or nay, just that expectation sometimes plays a huge role
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Old 23rd April 2013, 02:26 PM   #3
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
he has changed to a 10A fuse rather than staying with the recommended 750mA fuse. The sound must be 13 & 1/3 times better.
Don't let your bias for truth interfere.
regards Andrew T.
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Old 23rd April 2013, 03:16 PM   #4
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I'm asking for input from anyone who has experience of changing fuses for breakers. Some quick research shows me that a breaker might be a better option, but it depends on the spec.
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