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Post subject: Need help with Fender LTB amplifiee
Posted: Wed Feb 27, 2008 12:47 pm
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Hello everyone, I've got a problem with my Fender LTB amplifiee, I need a name of those two parts in the picture below, that are installed in it. The are burned and I don't know the name that is writed on it. Can anyone help me??

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Ragards


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Posted: Mon Mar 03, 2008 3:44 pm
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Igli,

Is there anything written on the ones to the right in your pic? Both of those are probably power transistors for the output stage (speaker) of the amp. The green one should be similar to the one on the far left each with their own heat sink (the piece of metal underneath). The larger one should be similar to the unburned one on the shared heat sink, though without the schematic diagram for the board, I can't guarantee they're identical, which they may or may not be. If you can find the model number printed on the unit, try to find it on Fender's support page under amplifier schematics. I tried looking up LTB and didn't have any luck. If you don't mind me asking, what caused them to self destruct?


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Posted: Tue Mar 04, 2008 6:47 am
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telecaster1987 wrote:
Igli,

Is there anything written on the ones to the right in your pic? Both of those are probably power transistors for the output stage (speaker) of the amp. The green one should be similar to the one on the far left each with their own heat sink (the piece of metal underneath). The larger one should be similar to the unburned one on the shared heat sink, though without the schematic diagram for the board, I can't guarantee they're identical, which they may or may not be. If you can find the model number printed on the unit, try to find it on Fender's support page under amplifier schematics. I tried looking up LTB and didn't have any luck. If you don't mind me asking, what caused them to self destruct?


The green one is diferent it is not the same name that on the one which is burned, first letter is not the same, second element is totaly burned so there is no name on it. I don't know what cause the damage or better white smoke and burned elements, I have no Idea! But I will be glade if someone had the same amp. and will open it , write the names that are on the elements and post it here or send PM to me!


Regards Pete


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Posted: Tue Mar 04, 2008 3:04 pm
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Pete,

Find the model number on the amp, usually on the back, and I can try to locate the schematic on the support page.

As for what fried it, there are a few possibilities:

The transistors failed- kinda unusual

The wiring to the speaker or speaker coil shorted out-0 ohms

Speaker impedance was lowered too much by hooking others in parallel

Excessive heat or insulator under transistor failed shorting to the heat sink.

I would highly recommend finding the cause, as simply replacing the transistors could end up destroying them as well. Something went BAD wrong to cause a catastrophic failure like this.


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