Tools
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It's alwasy a good idea to have all the parts and tools you'll need laid out before starting in a well lit area
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Unplug the amp and put on your safety goggles
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Remove the tubes, unplug the speaker, unplug the reverb from the chassis( be sure to note which plug is white and which is red), and remove the clips holding the power cable to the chassis
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Remove the screws holding the back panel and remove it. Unscrew the chassis screws and straps on the top of the amp.
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The chassis should slide out easily exposing the circuit board. It's easiest to work on with the chassis completely removed from the cabinet
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