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Is it the finals that are not sitting 100% flat to the heatsink?

If that's the case, the best thing to do is to unsolder them and remove them from the board. Clean the heatsink surface thoroughly, and lightly countersink the threaded holes where the screws go so there isn't any raised surface. Lay down some heatsink compound and install the transistors and bolt them down first, then resolder the tabs into place. This will ensure that the transistors are fully seated and contacting the heatsink. I do this procedure every time I have to replace finals in any amplifier. I've never had an amp come back to me with hotspot issues or a thermal issue.

Hope this info helps, let us know how you get on.

~Cheers~

[QUOTE="ExitThirteen, post: 633647, member: 6878"] Is it the finals that are not sitting 100% flat to the heatsink? If that's the case, the best thing to do is to unsolder them and remove them from the board. Clean the heatsink surface thoroughly, and lightly countersink the threaded holes where the screws go so there isn't any raised surface. Lay down some heatsink compound and install the transistors and bolt them down first, then resolder the tabs into place. This will ensure that the transistors are fully seated and contacting the heatsink. I do this procedure every time I have to replace finals in any amplifier. I've never had an amp come back to me with hotspot issues or a thermal issue. Hope this info helps, let us know how you get on. ~Cheers~ [/QUOTE]

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