Fuses amperage question

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.

Hi everyone.

Usblues
I spoke to the seller about the DNA-1 Deluxe and he was very apologetic, sincere and professional. He told me that he had his tech bench test it and during the test a failure occurred due to a wiring gaff. Due to a very busy day the tech and the seller had a mis-communication and the seller thought the DNA-1 Deluxe was good to go. Again the seller apologized and also informed me of a 90 day warranty. I'll try to get further detail in writing. Now I didn't notice the 10 amp fuses until I was swapping them out.

Magfan.

I'm going to keep the 7.5 amps in there kind of like what you did with your Maggies. If I had an overzealous roomie I'd probably lock up my preamp so he couldn't muck with the volume. ;) I'm going to ask the seller about the 10 amp fuses and the situation that called for them to be put in the DNA-1 Deluxe. I won't hold my breath for an answer but in the mean time I'm going to keep listening to the DNA-1 Dlx make music and when my tech gets back from vacation I'll look him up and let him check out my amp.

Rodman

Thanks for the contact info and I'm going to e-mail McCormack as well as SMcAudio and get the scoop.

So I'm guessing by upping the amp value on the fuses it causes the amp to receive more current and thus send out more power to speakers @ the cost of it's reliability? Sorry for the car analogy but is it kind of like bypassing the limiter on an engine allowing you to attain more power? I'm lucky the DNA-1 Deluxe is a tank & KEF Q-90 speakers are an easy load for it now. I'm listening to some Depeche Mode and Enjoying the Silence. ;)

Again a sincere thank you again to you folks for taking the time out to reply.

Good Evening all. Both Steve McCormack & Kris Jeter of SMc Audio got back to me with my inquiry about the 10 amp fuses that were in the DNA-1 Deluxe I purchased.

Here is what Steve said via e-mail & Kris echoed in a seperate phone conversation.

"The DNA-1 was originally delivered with 8A Fast-Blow rail fuses. These were changed to 10A fairly quickly because we were seeing some "nuisance" blowing of the 8A fuses on turn-on. The 10A Fast-Blow has remained the standard DNA-1 rail fuse since then. You won't hurt anything by using a lower value so long as they are FAST Blow."

Well I'm relieved. Thank You again everyone for chiming in and Thanks to Steve McCormack and Kris Jeter.

Now onto the researching of "audiophile" fuses. ;) Don't worry I won't post anything on this thread I'll read the older ones on the forum

All the best.