My Mesa Boogie has a loose screw
Occasionally we get this question in the Sweetwater service department: “A big screw is sticking up behind the tubes on my Mesa Boogie amp. What is this? Is something coming apart? “
This is known as the chassis tension screw (or bolt) . It it used to stop rattles in the chassis from acoustic vibration in the cabinet due to the powerful speakers.
It is a long bolt/screw that reaches all the way to the wooden cabinet above to cause a dampening effect to vibrations in the metal. It normally does stick out and IS NOT tightened down very much. Only tighten it until it makes light resistance against the top of the amplifier.
Click to enlarge.
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