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Fast acting fuses

I have a pair of JBL model CF120 speakers. Yesterday while listening to the system a ground wire came loose and the next thing I realized the right wo ofer was out. These speakers are protected by a couple of TC 2.5A fuses. On e of these fuses screws into a threaded holder, (and it was open) and the o ther clips into a two prong connector. Since I didn't have a small size TC fuse I swapped the good fuse into the threaded holder and I soldered, (pigg y backed) a 2.5A AGC type with pigtails onto the open TC fuse and clipped i t back into the socket.

So the TC fuse indeed protected the speaker, and I'm very grateful for that . I fixed the ground problem and until I can pick up the correct fuses this will work. However I was wondering if this TC type fuse is anything specia l? They are two different physical sizes but how does it compare electrical ly with an AGC type? In theory would AGC fuses be adequate protection for t hese speakers? I have boxes of them.

One interesting thing I thought I'd mention was that coming right out of ea ch speaker output on the amplifier there is a 2 amp MDX fuse that never ope ned. I know that the MDX is some type of time delay. Don't even know why th at was in there. I would appreciate any comments on this. Thanks, Lenny

Reply to
captainvideo462009
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he system a ground wire came loose and the next thing I realized the right woofer was out. These speakers are protected by a couple of TC 2.5A fuses. One of these fuses screws into a threaded holder, (and it was open) and the other clips into a two prong connector. Since I didn't have a small size T C fuse I swapped the good fuse into the threaded holder and I soldered, (pi ggy backed) a 2.5A AGC type with pigtails onto the open TC fuse and clipped it back into the socket.

at. I fixed the ground problem and until I can pick up the correct fuses th is will work. However I was wondering if this TC type fuse is anything spec ial? They are two different physical sizes but how does it compare electric ally with an AGC type? In theory would AGC fuses be adequate protection for these speakers? I have boxes of them.

each speaker output on the amplifier there is a 2 amp MDX fuse that never o pened. I know that the MDX is some type of time delay. Don't even know why that was in there. I would appreciate any comments on this. Thanks, Lenny

** JBL say the CF120 uses a 2.5 amp slo-blo fuse.

MDX are obsolete and replaced by MDL.

Lots of other options exist using T or TT fuses.

AGC is a fast type, same a F types and will bow too easily.

... Phil

Reply to
Phil Allison

Here is a little page I wrote on fuses if anyone is interested:

formatting link

Nothing on Polys though. Should update it I guess...

John :-#)#

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Reply to
John Robertson

On Friday, February 27, 2015 at 2:37:58 PM UTC-5, snipped-for-privacy@gmail.com wr ote:

he system a ground wire came loose and the next thing I realized the right woofer was out. These speakers are protected by a couple of TC 2.5A fuses. One of these fuses screws into a threaded holder, (and it was open) and the other clips into a two prong connector. Since I didn't have a small size T C fuse I swapped the good fuse into the threaded holder and I soldered, (pi ggy backed) a 2.5A AGC type with pigtails onto the open TC fuse and clipped it back into the socket.

at. I fixed the ground problem and until I can pick up the correct fuses th is will work. However I was wondering if this TC type fuse is anything spec ial? They are two different physical sizes but how does it compare electric ally with an AGC type? In theory would AGC fuses be adequate protection for these speakers? I have boxes of them.

each speaker output on the amplifier there is a 2 amp MDX fuse that never o pened. I know that the MDX is some type of time delay. Don't even know why that was in there. I would appreciate any comments on this. Thanks, Lenny

Thank you for including that page John and also the links. So I'm guessing as Phil has said that the AGC fuse will be the quickest to open, and may be somewhat of a nuisance, but will afford the circuit the highest amount of protection. I think that I can live with the occasional fuse blowing durin g those times I might feel like cranking the stereo up. Lenny

Reply to
captainvideo462009

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