thumbo Posted January 7, 2015 Share Posted January 7, 2015 Last night my GK 800RB amp blew a fuse, I've not had to replace a fuse in this amp before and I'm a bit unsure as to which fuse I should be replacing it with. The fuse I took out of the amp says 5A 250V 313 on it. But on the back of the amp it says I should use a T4A 250V fuse: [URL=http://s17.photobucket.com/user/edsnell/media/photo_zps8cbcc191.jpg.html][IMG]http://i17.photobucket.com/albums/b79/edsnell/photo_zps8cbcc191.jpg[/IMG][/URL] Is it ok to be using a 5A 250V 313 fuse in this amp? - Is this the same as a T4A 250V fuse? I've had a quick Google and ended up confused. I have no idea about this stuff! Thanks in advance! Quote Link to comment Share on other sites More sharing options...
morgano Posted January 7, 2015 Share Posted January 7, 2015 You need a Time Delay fuse (that's what the 'T' stands for). These are also known as 'Anti-surge' or 'Slow Blow'. It could be that the fuse you have in the amp (the 5A one) is a standard or fast blow type, which might explain why it has blown. You shouldn't exceed the 4A rating specified, as although a 5A fuse will work, you are raising the current at which it will blow to higher than the manufacturer specified, so putting the equipment at a higher risk of damage if there is a fault. There's loads on eBay - here's an example: [url="http://www.ebay.co.uk/itm/Fuse-4A-4-Amps-Time-Delay-Fuses-T4A-Anti-Surge-5-x-20mm-Glass-0239004-x10pcs-ONO-/291332491551?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item43d4c5091f"]http://www.ebay.co.uk/itm/Fuse-4A-4-Amps-Time-Delay-Fuses-T4A-Anti-Surge-5-x-20mm-Glass-0239004-x10pcs-ONO-/291332491551?pt=UK_BOI_Electrical_Components_Supplies_ET&[/url] [url="http://www.ebay.co.uk/itm/Fuse-4A-4-Amps-Time-Delay-Fuses-T4A-Anti-Surge-5-x-20mm-Glass-0239004-x10pcs-ONO-/291332491551?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item43d4c5091f"]hash=item43d4c5091f[/url] Hope this helps! Quote Link to comment Share on other sites More sharing options...
chris_b Posted January 7, 2015 Share Posted January 7, 2015 Only use the correct fuse. . . . . . and find out why it blew in the first place! Quote Link to comment Share on other sites More sharing options...
thumbo Posted January 7, 2015 Author Share Posted January 7, 2015 [quote name='morgano' timestamp='1420628897' post='2651414'] You need a Time Delay fuse (that's what the 'T' stands for). These are also known as 'Anti-surge' or 'Slow Blow'. It could be that the fuse you have in the amp (the 5A one) is a standard or fast blow type, which might explain why it has blown. You shouldn't exceed the 4A rating specified, as although a 5A fuse will work, you are raising the current at which it will blow to higher than the manufacturer specified, so putting the equipment at a higher risk of damage if there is a fault. There's loads on eBay - here's an example: [url="http://www.ebay.co.uk/itm/Fuse-4A-4-Amps-Time-Delay-Fuses-T4A-Anti-Surge-5-x-20mm-Glass-0239004-x10pcs-ONO-/291332491551?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item43d4c5091f"]http://www.ebay.co.uk/itm/Fuse-4A-4-Amps-Time-Delay-Fuses-T4A-Anti-Surge-5-x-20mm-Glass-0239004-x10pcs-ONO-/291332491551?pt=UK_BOI_Electrical_Components_Supplies_ET&[/url] [url="http://www.ebay.co.uk/itm/Fuse-4A-4-Amps-Time-Delay-Fuses-T4A-Anti-Surge-5-x-20mm-Glass-0239004-x10pcs-ONO-/291332491551?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item43d4c5091f"]hash=item43d4c5091f[/url] Hope this helps! [/quote] Thanks! So just to clarify, I need a 4A 250V Time Delay fuse? [size=4]The amp wouldn't switch on at my rehearsal last night, but I've not had any issues with it in the 4 years I've owned it for. Which is slightly worrying if it's been running with the wrong fuse for all this time.[/size] [size=4]I've been wondering what could have caused it. There's no signs of damp in my rehearsal place. It worked fine at my last rehearsal just before christmas but one thing I was wondering about is if going from a warm rehearsal room to a cold storage room could have caused condensation inside the amp. That's a complete guess though, I don't know anything about this stuff![/size] Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted January 7, 2015 Share Posted January 7, 2015 [quote name='thumbo' timestamp='1420642329' post='2651650']... [size=4]I've been wondering what could have caused it...[/size] [/quote] A Time Delay fuse will withstand, for a short period, an overload, usually, in the case of amps and such, upon switching on, where there is a short power surge. Once the initial surge passed, the current stabilises at below the fuse rating (4A in your case...). A 'normal' 4A fuse would probably blow under the same conditions. A 5A 'normal' fuse could, however, perhaps withstand the surge current, although henceforth the protection would not be as good (it would require a 'fault' current above manufacturer's ratings to occur, and damage could result...) It could well be, however, that, after all these years of being the wrong type of fuse, the surge current has finally got the better of the 5A fuse, causing it to fail. The test will be to replace it with a correct, 4A T fuse, and see what happens upon power-up. If the fuse blows, there is a real amp fault, needing technical repair. If the amp turns on as before, however, no harm has been done. Be sure to have a spare, correctly rated, fuse, just in case, for another day. Sometimes fuses fail simply through ageing. Hope this helps. Quote Link to comment Share on other sites More sharing options...
morgano Posted January 7, 2015 Share Posted January 7, 2015 [quote name='thumbo' timestamp='1420642329' post='2651650'] Thanks! So just to clarify, I need a 4A 250V Time Delay fuse? [/quote] Yes, that's correct. I also agree with Dad3353's post above. That might explain why it's been OK up to now, and like he says, you need to get the correct fuse and then take it from there. Quote Link to comment Share on other sites More sharing options...
goingdownslow Posted January 7, 2015 Share Posted January 7, 2015 Fuses can get tired after a while and just blow. Quote Link to comment Share on other sites More sharing options...
HowieBass Posted January 7, 2015 Share Posted January 7, 2015 It might be worth checking the speaker connection cable is sound as well just in case that's caused a short. Quote Link to comment Share on other sites More sharing options...
icastle Posted January 7, 2015 Share Posted January 7, 2015 I've come across this more than a few times before. The conversation afterwards generally goes [i]'I couldn't get a T fuse so I stuck a bigger F fuse in there, it doesn't make a difference does it?'[/i] If a fuse blows, [b]always[/b] replace it with the type that the manufacturer recommends - anything other than that then you're wasting your time at best and endangering yourself or others at worst. Quote Link to comment Share on other sites More sharing options...
thumbo Posted January 7, 2015 Author Share Posted January 7, 2015 Thanks guys, I'll order some correct fuses for it and see what happens. Quote Link to comment Share on other sites More sharing options...
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