Vox AD60VT Fuses

aceonbass · Post by **aceonbass** » Sun Apr 09, 2006 5:45 pm

My wife has a vox AD60VT that blew the fuse. What is the correct replacement fuse and where can they be bought? All I could tell about the original was that it was a 3.15 amp,250 volt fuse. I got some 3 amp 250 volt fast blow fuses(the only kind they had)at Radio Shack but they blow just as soon as the you switch the power on. The original fuse blew after turning the amp in and off in quick succession.

soundmasterg · Post by **soundmasterg** » Mon Apr 10, 2006 9:17 am

Most modern amps have many fuses in them, and depending on where that one is located it could call for a slow blow or a fast blow fuse. Even if you get it incorrect though, (fast blow vs slow blow), it still should not blow right away as soon as the power is turned on. I think that there is a problem with your amp that is going to require service. Either the power transformer is bad, a cap is bad in the power supply, some diodes are bad, or perhaps it could be that something else is wrong. I would suggest to get it checked out by an amp repair person. Fuses usually don't blow unless there is a failure in the amp of some sort.

aceonbass · Post by **aceonbass** » Mon Apr 10, 2006 11:41 am

The fuse in this amp is located directly below the power plug. I don't think turning the amp on and off twice in quick succession would burn out a transformer or any other internal component. I just need to know exactly what type of fuse this amp takes as Vox's website and Voxtalks is useless in this matter. Most amps I've had have specified slow blow fuses and the Radio Shack replacements were fast blow.

doctorwho · Post by **doctorwho** » Mon Apr 10, 2006 1:35 pm

Gee, the manual doesn't give the spec for the fuse! I'll check my AD120VTH when I get home from work and check the fuse in it, as it should be the same as for your amp, Dane.

doctorwho · Post by **doctorwho** » Mon Apr 10, 2006 7:46 pm

It's a 250V, 6.3A, fuse, length 20 mm; there is a three-circle symbol after the 6.3A, similar to the "therefore" symbol in math:

At the other end of the fuse is 51S followed by that same symbol. On this website:

http://www.globalsources.com/gsol/I/Radial-Lead-Micro/p/2000000003844/3000000149681/sm/1000977219.htm

I found out that a 51S is a slow-blow fuse.

Hope that helps.

scott_s · Post by **scott_s** » Mon Apr 10, 2006 8:02 pm

That's a pretty beefy fuse! I don't think Fender ever used more than a 4A fuse on anything!

aceonbass · Post by **aceonbass** » Mon Apr 10, 2006 8:20 pm

Thanks Gary. Even though mine has a 3.15 amp fuse, the fact that yours is a slow blo fuse is what I needed to know since the Radio Shack ones I have are fast blo fuses.

doctorwho · Post by **doctorwho** » Mon Apr 10, 2006 9:34 pm

You're welcome, Dane. I still can't believe that the manual does not specify what that fuse is!

soundmasterg · Post by **soundmasterg** » Tue Apr 11, 2006 12:37 pm

Dane, any fuse that is used in a power supply section is usually going to be a slo blo fuse, because you don't want the AC line fluctuations to blow the fuse, and often a fast blo will blow for not reason when used in this application. What I was saying earlier about possible problems in the amp could be correct, because just subbing in a correct value fast blo fuse and turning the amp on should not make the fuse blow. Typically, a fast blow in that position in the amp could possibly not blow for years after putting it in. A slo blo is correct for anywhere in the power supply though.

If you put in a slo blo fuse of the correct value and it blows right away, then there is a problem with the amp that could have been caused by something other than you flipping it on and off quickly. Hopefully its as simple as putting the proper fuse in there however.