Curious bolt in a Fillmore 25

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Peteoh

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So just received a used Fillmore 25 and noticed this Phillips head bolt hanging there. It doesn’t want to thread in or out but is loose to rattle around in the chassis hole ??
I can fit a grommet to it to silence it, but what is it for ?
 
Chassis tensioner bolt. It presses against the cabinet and helps damp out chassis vibrations which can be a problem at high volume.

A fair number of amps use that idea.

Loosen it when removing the chassis from the cabinet. After reinstalling the chassis, snug that screw up firmly.
 

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