The thermodynamic transfer of excessive heat generated by transformer, signal conversion and vacuum tube components in the confines of a steel enclosure has traditionally been managed through caloric / entropic thermal conductivity. Sometime after the invention of the wheel, man invented venting slots. <br/><br/>
Translation: warm air comes out the holes (and it looks pretty cool, too). <br/><br/>
$19 bucks in black powdercoat.<br/><br/>
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