Fuses amperage question


Hello--I'm planning on swapping out the fuses in my Unison Research Unico SE integrated amp, and I noticed something peculiar. While the booklet says that the six internal fuses should be 1A, 500mA, and 10A (two of each), I look at the circuit board ratings next to the fuses and got a different story: they were, respectively, 1.3A, 1A, and 1.6A. If I go ahead with changing the fuses, should I go by the manual or the circuit-board indications? Thanks in advance for any advice,

JB Coleman
jamesbrianc
I don't know, but if I had to guess I'd chose to think the 10A fuses should have been listed as 1A. If for no other reason than 10A's is letting a lot of stuff pass, and the difference between 1A and 10A could be a simple printing edit error. In each other case the circuit board rating are higher than the recommended rating in the manual. Makes sense to me, but I'd get an OK from the manufacturer before I'd use 10A fuses, or I'd just use 1A fuses and see if it blew out pre-maturely. FWIW, probably not much. :-)
Check the actual fuses. They should be labeled as to what they are. Just take note if fast-blow or slow-blow. Get exactly whats in the amp now nothing else or damage may occur.
Greetings all

I recently purchased a McCormack DNA-1 Deluxe and it had blown fuse on one of the B+/Bi Power Supply Rails. I opened up the amp and saw the following fuses in the amp.

BUSS AGC10 250V UL SA

These are 10amp fuses correct?

I took a look @ the manual of the DNA-1 and it stated that for the B+/B- Power Supply Rail Fuses 8 Amp Fast Blo fuses should be used.

Is it ok to use 10 amp fuses if the manual calls for 8 amp fuses? What harm if any would I be doing to the amp should 10amp fuses are used?

Lastly I was only able to get 7 1/2 amp 250V Fast Blo fuses locally. I went everywhere I could. Is it ok if I use a lesser amperage fuse? Would I be cauing harm to the amp as well by use a lesser amperage fuse? Would SQ of the DNA-1 Deluxe be affected by different fuses with either lesser or more amperage than specified? So far I've been listening to the DNA-1 Dlx with only the 7.5 amp fuses installed and it sounds great. I'm just trying to make sure I don't mess up the amp or something worse.

Thanks so much and sorry for the novice questions.
You may want to ask why the fuse blew if you just bought it.Something fishy going on in there though it could be a simple matter of a cat crossing speaker wires????Dont know but you'd best,good luck,B
You BET. replace 'em with SAME VALUE or sometimes lower.
Not that it matters, but in an effort to protect my panels from my overzealous roomie, I replaced the 1.5 amp fuse with a 1 amp. And Told him to watch the loudness.

For USED equipment, I'd be careful. The higher value may have been installed to make the amp run for a while. If it popped right when fired up, you could have beefed. Now, you'll have a fight on your hands.
Replacing an 8 with a 10 is a NO NO. 'Proving' who changed the fuse...and the motive, will be impossible.
You may want to get the amp checked by a service pro.