I've been fixing a stereo amplifier, and i finally found the fault. But i can't seem to understand what component it is, nor how to search the web for it. I've linked the picture.
So if you could help me find out what this is i would be grateful!
Still working on my english, might be some strange sentences.

 

I've been fixing a stereo amplifier, and i finally found the fault. But i can't seem to understand what component it is, nor how to search the web for it. I've linked the picture.
So if you could help me find out what this is i would be grateful!
Still working on my english, might be some strange sentences.

It is two precission .22ohm 5 watt resistors. With very low inductance. The figure on the PCB show how they are connected

 

Any tips for what i could write to search for it on the web?

 

Dual resistor seems to get pretty good results.

 

Thank you ^^

 

Are you sure it is broken. You have to take it out of the circuit to know for sure. It can be replaced by any low inductance precession 5 watt 0.22ohm resistor pair

 

Are you sure it is broken. You have to take it out of the circuit to know for sure. It can be replaced by any low inductance precession 5 watt 0.22ohm resistor pair

I took picture of a similar one. The broken one were black. i even opened it and saw that it were burned apart

 

It may also be that this is collateral damage and the real error is some place else

 

It may also be that this is collateral damage and the real error is some place else

Might be. But i have gone through the whole circuit board while measuring, and i only pinned down to the one dual resistor.

 

You can use about 2m bell wire + a permanent marker to make a coil. Who cares about inductance at audio frequency of maybe 1uH.

Such a dual precision resistor might be rare + expensive.

 

I have a question. How do you know it is the fault?

 

There are two possibilities, either the output pair transistors are shorted, or the speaker output was shorted and this resistor was the weakest point. It´s up to OP to find the fault.

 

Blown output transistor, likely coupled with a speaker wire short, will take out the emitter balance resistor. The amp needs a proper repair.

 

Blown output transistor, likely coupled with a speaker wire short, will take out the emitter balance resistor. The amp needs a proper repair.

I agree. Resistors don't fail catastrophically on their own. Their value may drift, but if they are burnt, it is because they acted like a fuse for another component that went out of control.

 

I would check both transistors behind it. looks like emitter resistors

 

I've been fixing a stereo amplifier, and i finally found the fault. But i can't seem to understand what component it is, nor how to search the web for it. I've linked the picture.
So if you could help me find out what this is i would be grateful!
Still working on my english, might be some strange sentences.

http://www.mcmelectronics.com/product/DISTRIBUTED-BY-MCM-RGC55--33-/28-0545

Dual emitter resistor

link to mcm electronics

 

the symbol on the PCB says it all