[Elecraft] How and How Often to Clean KPA-1500 Cooling Systems?

[N4ZR]

The other day I noticed some buildup of dust on the top vents of my 
power supply.  I used a vacuum on them and was surprised by how much 
appeared to come out from inside.  This raised a question - how often is 
it recommended to clean the cooling systems of the amp and its power 
supply, and what's the best way to do it?

-- 
73, Pete N4ZR
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