Cool it!

Put the amp in a refrigerator, drill holes for the cables and power cord, and place the refrigerator on springs. Problem solved! 🤗

1 1/2” piece of granite placed as to not block the vents. Conducts some heat and helps with vibration maybe.

I do not use any kind of cooler on my two-channel analog system, even with its 100wpc tube amp. It's just not needed.

However, I found that modern multi-channel AV processor/receivers certainly are in need of additional cooling (mostly due to the A/V boards, I think) so I utilize a Cooler Guys twin fan cooler on top of my Integra receiver that draws the hot air up and out of the unit and allows it to run much cooler after a double feature movie night in my HT room.

I use Class D.  Very efficient and not much heat generated. 

Fans & Cooling = Noise.  Not a good idea.  As long as their is space around the amp, all is good.  My tubes put out some heat, but the manufacturer already knew that when they created the design.