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Troubleshooting AX2 Sound Issue

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With all this time on my hands, I'm trying to bring my ax2 from high school back to life. I have a basic understanding of electronics and I feel comfortable soldering but by no means am I an expert.

Issue After playing my guitar through the amp for about 5-10 minutes, the sound starts to crackly and pop, dropping intermittently in volume. In general, shutting it off and starting back up seems to bring it back to a working state.


Theory: I'm guessing possibly an issue with the LM3886TF amps. Since it seems to take time, after it's been running for a bit, it could be heat related. When I opened up the amp, I could tell that the heat goop had been replaced/applied in a sloppy way. The Serial number is EI4xxxx so I think it's one of the later models that doesn't have an issue with the transformer. 


Since there are two large circuit boards inside the AX2, is there a way to isolation the one with the amplifiers for testing?


Thanks in advance for any help.





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Disconnect the amplifier output that seems to be distorting and try listening through the other

If the crap goes away , it's the disconnected amp module.

If it's heat related , look and see if the screws holding the amp module against the wall are tight

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