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RE: damping heatsink fins

Posted by Lew (A) on February 17, 2016 at 11:16:19

In Reply to: RE: damping heatsink fins posted by henrylr on February 17, 2016 at 09:17:01:

I think you are correct about the spike on the bottom of the McCormack chassis. If I recall correctly, that was said to mechanically ground it, if pegged into a wood shelf, for example.

On the heat sinks, after posting I was thinking that I have not usually noticed much vibration of heat sink fins, and/or that if they are vibrating, they must be picking up some mechanical energy from something either within the chassis or the chassis itself. If the latter, then damping the chassis per se might eliminate heat sink vibration without at all impeding the job of the heat sink, which is to dissipate heat. If the mechanical energy is coming from within, most likely the transformer, then one might check the bolts that hold the transformer laminations in place to see whether they are loose and could benefit from being tightened. However, one must be careful not to over-tighten them. Or else, check the bolts that hold the transformer to the floor of the chassis. Typically they use rubber grommets to isolate the mechanical vibration of the transformer from the chassis.

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