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 Post subject: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 4:47 pm 
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Is it ok to use a 1A 250V fuse for a silverface Fender Champ? The amp chasis says 1A 125V, but I bought it and there was a 1A 250V fuse in there so I bought those to replace it when it blew and then realized that it said 125V on the chasis. Any ideas?


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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 4:56 pm 
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Do not over-spec the fuse. It's there for a reason -- to save the amp in the event of some calamity.

Also, use the "slo-blow" type for which the amp was designed.

Arjay

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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 5:11 pm 
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Electronics are spec'd for a reason. ALWAYS use the proper fuse. Arjay nailed it with the slo-blow also.

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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 5:15 pm 
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Quote:
Do not over-spec the fuse. It's there for a reason -- to save the amp in the event of some calamity.

Also, use the "slo-blow" type for which the amp was designed.

Arjay


I've been looking for a 1A 125V Slo Blow fuse and I cant find them anywhere. Any ideas where I could get some? :?:


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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 5:54 pm 
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Ahem...Google is your friend. I spent two minutes and found this...and plenty others.

http://www.mouser.com/Circuit-Protectio ... Mgod-g0A6g

HTH

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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 6:06 pm 
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T2Stratman wrote:
Ahem...Google is your friend. I spent two minutes and found this...and plenty others.

http://www.mouser.com/Circuit-Protectio ... Mgod-g0A6g

HTH

T2


Thanks, I checked it out but they don't have the one I'm looking for. Rare fuse I guess.


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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 6:30 pm 
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Bedlam9 wrote:
T2Stratman wrote:
Ahem...Google is your friend. I spent two minutes and found this...and plenty others.

http://www.mouser.com/Circuit-Protectio ... Mgod-g0A6g

HTH

T2


Thanks, I checked it out but they don't have the one I'm looking for. Rare fuse I guess.


Have you tried your local Radio Shack? They always seem to have those hard to find items like this.

T2

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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 6:52 pm 
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T2Stratman wrote:
Bedlam9 wrote:
T2Stratman wrote:
Ahem...Google is your friend. I spent two minutes and found this...and plenty others.

http://www.mouser.com/Circuit-Protectio ... Mgod-g0A6g

HTH

T2


Thanks, I checked it out but they don't have the one I'm looking for. Rare fuse I guess.


Have you tried your local Radio Shack? They always seem to have those hard to find items like this.

T2


A 0.5 amp, 250 volt fuse is the same as a 1 amp, 125 volt fuse. :idea:

http://www.radioshack.com/product/index ... d=2102746#

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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Tue Feb 12, 2013 8:24 pm 
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I'll check out the shack, and thanks for the advice, Bill, I'll keep that in mind.


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 Post subject: Re: Fuse for 1975 Silverface Champ?
PostPosted: Thu Mar 07, 2013 1:33 pm 
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bluesky636 wrote:

A 0.5 amp, 250 volt fuse is the same as a 1 amp, 125 volt fuse. :idea:

http://www.radioshack.com/product/index ... d=2102746#


No! Bad advice! Fuses are designed to open when the current rating is exceeded, so a 1 amp fuse gets replaced with a 1 amp fuse, always. Oh, you won't hurt anything putting a 0.5 amp fuse in, but that means it might blow when it's working normally, which you don't want.

The voltage rating of the fuse is the maximum working voltage the fuse can have across it if it does blow. This is to ensure the fuse does not arc over if it blows. It is perfectly acceptable to replace a 1 amp, 125 volt fuse with a 1 amp, 250 volt fuse, provided the working voltage does not exceed 250 volts. Putting a fuse with a higher current rating in is NOT acceptable though.

To the OP, the slow-blow type fuse is important. The surge when the unit is first turned on might be enough to momentarily exceed the fuse rating, so a slow-blow is designed to withstand this. If you put a normal (fast blow) fuse in, it might very well blow even if nothing is wrong. So, to answer your question, it is fine to put 250 volt, 1 amp, slow-blow fuse in.

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