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Old 10-20-2018, 10:55 PM   #78
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Join Date: Mar 2013
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Default Re: Electron Kinetics Eagle 2C amplifier problem

After looking at your photos of the PC board again up-close I am thinking perhaps some of the power transistors for the bad channel aren't actually soldered to the PC board. Or rather, their solder connections broke off. As far as I can tell there isn't much of anything mechanically holding the PC board except for the soldered pins of the large power transistors and the speaker output binding posts. I don't see any bolts or screws holding the PC board.

So, seriously, as suggested by an earlier post, it is really important to unbolt all of the power transistors from the heat sink and the pull out the PC board so you can inspect the back side of it. You may have to unbolt or unsolder the 4 speaker ouput binding posts in order to remove the PC board.

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