Made a trade with a guy on craigslist and he threw in a spider 3 120 chassis he couldnt fix it and it was unusable.
When i got it and tried it i could only use it for about 5 minutes before it started its rebooting cycle. It had been unused for so long i think it was reset. After it started its rebooting cycle it then started rebooting quicker till it was reset again.
I watched a youtube video some guy put heatsinks on the standoffs and a heatsink on the larger processor chip on the effects board.
This didnt seem like a good solution to me, i kinda know how the larger transistor/fets work and i know they are metal on the backside and are usually bolted to heatsinks.
I bought a few of the smaller heatinks came in a quantity of 10 and were about the same size as the power transistors/voltage regulators that are on the effects board.
instead of bolting them to the standoffs i put thermal paste on them and put them UNDER the transistors then bolted them back down with the standoffs.
After a reset the amp functioned a little longer but they still were overheating, and the amp still shut down and rebooted.
So the last thing i tried was a small 60mm fan i got off e-bay, hooked to a 4.5V wall wart supply i had laying around. That blows enough air over the sinks and keeps everything cool enough i can now use it for hours without any issues.
Put about $15. into it with the heatsinks and fan and some time hacking the sinks with a dremel so they didnt touch any of the surrounding caps or components.
[attachment=4867:Line 6 spider 3- 120 watt 2X10.jpg]
[attachment=4868:Line 6 spider 3- 120 watt 2X10-2.jpg]
I wired the wall wart to the power switch so that when i turn on the amp it also connects the wall wart to A/C and powers the fan.
The fan in the image was a larger case fan i had for testing. The 60mm fan is bolted to the back threw te rear vents.
[attachment=4869:Final cooling setup.jpg]