Fuse ID

[Superampman]

Can someone shed some light on what kind of fuse this is? TIA

 

[cademan]

Slo-blow.

 

[Blue Shadow]

The numbers on a nice Buss or Littlefuse should google some good information. Agree with cademan it is a slo-blow.

 

[Superampman]

Sure, but what's with the carbon comp resistor? It's .5A 250v.

 

[Powertech]

What did it come out of and where was it fitted?

 

[toxcrusadr]

It's a fusistiresisticator, obviously.

 

[Superampman]

What did it come out of and where was it fitted?

It's out of an Acoustat DD servo charge mono amp I just bought on ebay. I bought them as is not functional, however I see no obviously burnt semiconductors in either amp. Each has 2 fuses, the one pictured and another 500ma fast blow right beside. One amp's pictured fuse is blown, while the other's 500ma one is blown. They both look very clean, undamaged. Could have been a power surge/storm that blew the fuses. I just need to name them in order to replace it.

 

[I LIKE MUSIC]

It is not totally uncommon to see a resistor inside a fuse.

It is one method used to design the time to blow characteristics of the fuse. Some equipment manufactures will want a fuse with a specific time to blow versus overload characteristic to prevent nuisance fuse failure, while providing safety.

Fuses are not used to protect equipment, they are used for safety.

Doing a search by this "Acoustat DD servo charge mono amp" I found a service manual. It lists 2 fuses. It does not specify any type of special slow blow fuse. If I did not find the correct piece of gear, then disregard.

 

[Superampman]

It is not totally uncommon to see a resistor inside a fuse.

It is one method used to design the time to blow characteristics of the fuse. Some equipment manufactures will want a fuse with a specific time to blow versus overload characteristic to prevent nuisance fuse failure, while providing safety.

Fuses are not used to protect equipment, they are used for safety.

Doing a search by this "Acoustat DD servo charge mono amp" I found a service manual. It lists 2 fuses. It does not specify any type of special slow blow fuse. If I did not find the correct piece of gear, then disregard.

View attachment 1124645

Thanks. I do have the service manual which I should have looked at.

 

[WaynerN]

How do you know the fuse you found in the unit is the original one.

 

[I LIKE MUSIC]

How do you know the fuse you found in the unit is the original one.

Thanks. I do have the service manual which I should have looked at.

He can check it against the service manual.

 

[WaynerN]

I have a drawer full of slo-blo fuses and none of them have a resistor in them.........

 

[Superampman]

I just looked at the manual. That fuse is not mentioned as shown. As already pointed out, F1 is 5A slo-blo, and F2 500ma also slo-blo, nothing fancy. A number of causes are mentioned in the trouble shooting guide, namely worn out tubes which I have lots of replacements for. First thing I'll try.

Thank you for the attention.

 

[I LIKE MUSIC]

Some slow blow fuses may not look like they have a stand alone fuse in them, but they may have nichrome (resistance) wire wrapped around the fuse element. Again, it is all about the desired characteristics.



And of course there are fuses that do not require a stand alone resistive component.

I just looked at the manual. That fuse is not mentioned as shown. As already pointed out, F1 is 5A slo-blo, and F2 500ma also slo-blo, nothing fancy. A number of causes are mentioned in the trouble shooting guide, namely worn out tubes which I have lots of replacements for. First thing I'll try.

Thank you for the attention.

I am glad that you have the fuse issue sorted out. Hopefully the repair will be minor.

Good luck with your repair.