Fuse for Ampeg SVT-3Pro

FireGloRIC · #1 11-01-2011, 07:21 PM

My fuse blew and I want to make sure that I get the right replacement, since I purchased this amp used. The one that is in there is a 10A/250V Fast-Acting Ceramic but I see some things indicating slow blow fuses. Which do I need? Is there such thing as a slow blow ceramic?

vin*tone · #2 11-01-2011, 07:58 PM

Slow blow. yes.

**B-string** · #3 11-01-2011, 09:46 PM

Ceramic or glass does not matter, only the size and amp rating (unless in the HV secondary then it would be a 600V fuse).

RickenBoogie · #4 11-02-2011, 07:13 AM

If you blew a fuse, there's a reason- so replacing the fuse won't fix it. Take it in to an amp tech and cure the cause of the problem, or risk further damage.

grendle · #5 11-02-2011, 07:29 AM

Putting a fast blow in place of a slow blow could be the issue. Replace it with a 250v 10 A slow blow if that's what its rated for (should be available at any hardware store or auto parts store). If you blow the fuse again there's an issue.

Most gear has a big current spike at start up as soon as you flip the switch, this can pop a fast blow, which is why a slow blow is usually used for the main fuse.

mdogs · #6 11-02-2011, 08:28 AM

Quote:

Originally Posted by RickenBoogie

If you blew a fuse, there's a reason- so replacing the fuse won't fix it. Take it in to an amp tech and cure the cause of the problem, or risk further damage.

Fuses blow for a myriad reasons that may or may not indicate other problems. The OP is taking the right steps by
making sure that the fuse that blew is being replaced by a fuse of the correct value. If there is another problem, there is a very high chance that it will blow the fuse again protecting the amp from further damage (like the fuse blowing is supposed to do).

FireGloRIC · #7 11-02-2011, 06:37 PM

Our power was knocked out due to a storm for several days. When I went to use the amp after the power was restored there was no power. I am hoping that's all it was. I am having a rough time finding the slow blowing fuses at 10A/250V. I did find a fast acting and put it in to test the amp. All appears to be OK but I am not using it until I find the right one. Any suggestions? Radio Shack had none.

LOLeaux · #8 11-02-2011, 06:44 PM

After spending most of a day driving around L.A. looking for these fuses and finally finding them, I'd suggest skipping that step and looking online.

grendle · #9 11-02-2011, 07:12 PM

Quote:

Originally Posted by LOLeaux

After spending most of a day driving around L.A. looking for these fuses and finally finding them, I'd suggest skipping that step and looking online.

Any hardware store should have them. Fry's or allparts? ( big electronics surplus store in the valley, off supulveda I think) would be a sure bet. 10A is a little big but is common in any auto parts store.

**B-string** · #10 11-02-2011, 07:25 PM

Auto part stores will not have slo-blo. allelectrinics.com Mouser Electronics - Electronic Component Distributor Electronic Components Distributor | DigiKey Corp. | US Home Page just a few.

LOLeaux · #11 11-02-2011, 10:06 PM

Quote:

Originally Posted by grendle

Any hardware store should have them.

Maybe they should. Actually they didn't.

grendle · #12 11-02-2011, 10:41 PM

Quote:

Originally Posted by LOLeaux

Maybe they should. Actually they didn't.

Did they have fast blow and just not slow? Or not the amperage you were looking for?

anderbass · #13 11-03-2011, 10:21 AM

Man, I'd expect that model amp would call for a smaller fuse like maybe a 4 or 5-amp. Does the amps labeling or manual actually say its supposed to have a 10-amp fuse, or is that just the size fuse that was in it when you bought the used amp?

BassmanPaul · #14 11-03-2011, 03:02 PM

The correct value for the fuse should be on the back panel next to the fuse holder. You should ALWAYS verify what is actually required before you replace a fuse in any used new to you equipment. I've found, over the years, foil wrapped around the fuse, links of wire across and even a nail. Don't trust that folk always do the right thing - it's seldom that they actually do.