Power amp blowing fuses?

[peaveyrules]

Hooked up our old power amp, and it stayed on for a good 5 seconds, then died all of the sudden for some reason. Got to looking, and I decided to change the fuse in it, seeing as the other one was realy really old. Tried it again, and it turned on for another 2 seconds before dying down, so I know its a problem with the fuse, a short or something. The original fuse says "Buss ABC-15....250Volts". I've looked around, and I can't seem to find any glass tube "ABC-15, 250Volt" fuses. The closest I've found are "AGC-5a, 250Volts. Anybody know a possible solution to the problem, or what kind of exact fuse I need?

Thanks

[10571z]

im i have no idea maybe ask a professional.

[jmlb13]

Alright there are 2 ratings on a fuse a voltage and an amperage rating the fuses you need are 15 amps hence the 15 in the abc15 and one that is 250 volts. you could theoretically use a 120volt fuse however it would blow anytim line voltage gets above 120 and in the average wired jack line voltages can range from 100- 130 easily so i reccomend a 250 these can be easily aquired at the local radio shack hardware store or walmart. Radioshack willl be the best bet because the will have slow and fast blow types and you want fast blow in an amp. So Directions
1 go to radio shack
2 ask sales person for 15 amp 250 volt glass fast blow fuses
3 pay about 3 dollars for 5 or so
4 leave

[Aes820]

15 amps is a lot for an audio amplifier amp tho.
Like a real lot!
Are you sure? It's gonna want to be a bloody big amp.
Most convection heaters even draw no more than 10 amps.

Usually when an amp is using fuses it's an indicator that there's something wrong in the guts of the amp. Maybe a short.
I think your best option would be to take it to a tech.

[headshrinker]

You might wana check the speakers. I had a problem with an old mixer blowing fuses every time it was turned on. Kept replacing hte fuses well about three times, in the end tried it with a diffrent set of speakers and it worked fine. The ohms were matched it was just a problem with the speakers no idea what and they had worked fine sometime before if i rember. Just another thing to look at if the fuses keep blowing.

[jmlb13]

15 amps is a lot for an audio amplifier amp tho.
Like a real lot!
Are you sure? It's gonna want to be a bloody big amp.
Most convection heaters even draw no more than 10 amps.

Usually when an amp is using fuses it's an indicator that there's something wrong in the guts of the amp. Maybe a short.
I think your best option would be to take it to a tech.


the 15 amp fuse is likely after the transformer within the amp. This is probalbly a fuse in the DC current going to the speaker. 15 amps in a dc circuit is not uncommon at all. I have 40 amp fuses attacted to some solid state dc amps that i use for out door audio. It is also likely that the speakers are at a resistance too low for the amp to take. If 2 4 ohm speakers were plugged into one channel of this cs800 then the 2 ohm load would just be too much for it to handle.

[Aes820]

If that is the case then having a protection fuse on the secondary side of the power transformer is not a good design.
I'd consider it to be unsafe, and it really should be moved onto the primary side of the power transformer.