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Supplementary heat sink?

Posted by LtMandella on September 13, 2020 at 10:44:44:

I own a Musical Fidelity A1-2008 version class a amp.
The sound is gorgeous, liquid, sweet, smooth, extended highs, tight bass, midrange is a bit forward and clear as a bell. Not much sybilance and overall I can listen for hours with no listening fatigue. One of my favorite amps...
HOWEVER, it runs quite hot and since it is now unobtanium (long out of production and they only made a few thousand units from what I have heard) I am worried the heat will take it's toll on the life of the unit.
The case has a "ridged" aluminum top (depth of ridges looks to be only 3 - 5 mm).
I would like to find a fanless solution to supplement the heat sink function of the case.
Currently I do have a "side-blowing" (sounds a little pornographic) muffin fan sitting on the top of the case with air flow directed towards the hottest quadrant of the case top.
But I fear it is not adequate, the top plate is still hot although with the fan operating I can leave my palm on it for 20 seconds or so with minimal discomfort. Without the fan I could not do that.
Any ideas for a supplemental heat sink that could sit on the ridge top plate of the case and provide supplemental heat dissappation?
I thought about those aluminum bricks that are avaailable on the bay for a reasonable price, but sitting on a ridged top plate I doubt there would be much heat transfer, and running the amp for hours at time might even heat up the block to the point where it would not absorb more heat.
I suppose a really strong fan would work but they are all noisy!
I will be a bit heartbroken if this amp dies up before I do :(
thanks for any ideas!
[[edit]]
Maybe a Peltier cooling device? But how loud is the fan? And sitting on a ridged case, the heat transfer would be poor?