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RE: Supplementary heat sink?

First thing you want to do is have the amp serviced by a competant technician. Have him clean out the old silicon grease (thermal paste) from the output transistors and the mating site on the inside of the heatsink. Reinstall with plenty of new silicon grease. Then check the bias and adjust to spec. Bring it home and run it for an hour and then measure the temp with a digital thermometer. Install your chosen supplimental heat sinking device and measure again after an hour to see if you have a lower overall temp. If you can reduce the temp by 10-15 degrees thats plenty. I have serviced lots of those amps over the years and they do run hot. A complete service every couple of years as above will extend the life. Consider changing the output transistors as they are certainly stressed by now if they are the originals. Should not be too expensive but pay a little more to a real pro over a bargain fix by a cowboy. Nick Gowan at True Sound in Campbell California is highly thought of.


Edits: 09/14/20
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