Mystery Amp Rating on Fuse

DreadPirate · 23rd April 2006, 07:45 PM

I popped out a fuse near the transformer on my C-2 for inspection and it came apart, so I need to replace. The fuse is AGC type 1/4 x 1-1/14 size, there is a 250V rating on it, but no amp. What are these when they do not indicate an amperage? BTW, the filament is about the thickness of a lightbulb's...

anatech · 23rd April 2006, 09:26 PM

Hi DreadPirate,
What does it say on the rear panel by the fuse holder? It's probably a slow blow type given the low current rating. You can use a 1/4 to 1/2 amp just to test. Do not fail to install the proper type.

The only reason I give you this advice is that we know the preamp is not drawing excessive current.

-Chris

willyhoho · 23rd April 2006, 10:40 PM

You can always connect a DMM across the fuse clips if you can access
them and check the current. GOOD LUCK

anatech · 23rd April 2006, 10:45 PM

Hi willyhoho,
That will give you an error. With preamps and other low current devices, the turn on surge is far, far greater than their steady state current draw. The fuse is sized larger than you would expect and is also generally a time delay type.

Otherwise the warranty program would kill them!

The fuse rating ought to be marked on the chassis near the holder, or just inside the chassis near the holder. No guessing required.

-Chris

DreadPirate · 24th April 2006, 06:24 AM

The fuse has only "250V" on one end and on the other end "BUSS AGC1/4". I ran out and got a .25A fuse and all is well. There wasn't anything written in the vicinity of the fuse.

anatech · 24th April 2006, 01:10 PM

Hi DreadPirate,
Then do yourself a favour and write the fuse value inside the chassis near the fuse holder. If the new fuse blows randomly, replace it with a time delay fuse.

-Chris

23rd April 2006, 07:45 PM	#1
DreadPirate diyAudio Member Join Date: Jan 2006 Location: Northern Virginia, USA	Mystery Amp Rating on Fuse I popped out a fuse near the transformer on my C-2 for inspection and it came apart, so I need to replace. The fuse is AGC type 1/4 x 1-1/14 size, there is a 250V rating on it, but no amp. What are these when they do not indicate an amperage? BTW, the filament is about the thickness of a lightbulb's...

23rd April 2006, 10:40 PM	#3
willyhoho diyAudio Member Join Date: Nov 2005	fuse rating You can always connect a DMM across the fuse clips if you can access them and check the current. GOOD LUCK

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23rd April 2006, 09:26 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi DreadPirate, What does it say on the rear panel by the fuse holder? It's probably a slow blow type given the low current rating. You can use a 1/4 to 1/2 amp just to test. Do not fail to install the proper type. The only reason I give you this advice is that we know the preamp is not drawing excessive current. -Chris

23rd April 2006, 10:45 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi willyhoho, That will give you an error. With preamps and other low current devices, the turn on surge is far, far greater than their steady state current draw. The fuse is sized larger than you would expect and is also generally a time delay type. Otherwise the warranty program would kill them! The fuse rating ought to be marked on the chassis near the holder, or just inside the chassis near the holder. No guessing required. -Chris

24th April 2006, 06:24 AM	#5
DreadPirate diyAudio Member Join Date: Jan 2006 Location: Northern Virginia, USA	The fuse has only "250V" on one end and on the other end "BUSS AGC1/4". I ran out and got a .25A fuse and all is well. There wasn't anything written in the vicinity of the fuse.

24th April 2006, 01:10 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi DreadPirate, Then do yourself a favour and write the fuse value inside the chassis near the fuse holder. If the new fuse blows randomly, replace it with a time delay fuse. -Chris

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