Crossover Fuse Limiter Bulb

acorkos · 02-05-2009, 06:54 PM

could a 3AG 2 amp fast blow fuse be substituted for one of these.....?

http://www.speakerrepair.com/Merchan...Category_Code=

cbarrow7625 · 02-05-2009, 07:22 PM

No. A fuse is designed to just blow, not glow. It is the glowing action that makes it work as a limiter. As the bulb turns on it heats the element, the heating then increases the resistance of the wire. The increased resistance forms a voltage divider with the impedance of the driver & reduces voltage drive to the HF.

A fuse will just heat up with no glow and then suddenly blow.

A lot of speaker manufacturers use 12volt automotive bulbs (although there are better, more linear choices). Get a few different 12V automotive bulbs and use whichever one seems to work the best. The "bulbs" used by professional speaker manufacturers are almost always 12v at anywhere from 0.3-2amps of current capacity. A 0.5 amp or so auto bulb ought to protect a low power HF.

02-05-2009, 06:54 PM	#1
acorkos Senior Member Join Date: Jul 2006 Posts: 198	Crossover Fuse Limiter Bulb could a 3AG 2 amp fast blow fuse be substituted for one of these.....? http://www.speakerrepair.com/Merchan...Category_Code=

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02-05-2009, 07:22 PM	#2
cbarrow7625 Senior Member Join Date: Mar 2007 Location: Philadelphia suburbs Posts: 366	No. A fuse is designed to just blow, not glow. It is the glowing action that makes it work as a limiter. As the bulb turns on it heats the element, the heating then increases the resistance of the wire. The increased resistance forms a voltage divider with the impedance of the driver & reduces voltage drive to the HF. A fuse will just heat up with no glow and then suddenly blow. A lot of speaker manufacturers use 12volt automotive bulbs (although there are better, more linear choices). Get a few different 12V automotive bulbs and use whichever one seems to work the best. The "bulbs" used by professional speaker manufacturers are almost always 12v at anywhere from 0.3-2amps of current capacity. A 0.5 amp or so auto bulb ought to protect a low power HF.

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