[Elecraft] KPA500 fan noise

[Arthur Nienhouse]

*/ I put a Noctua NF-A9x14 PWM  pusher fan on the inlet this helped a 
bit,with a  typical over during a cw rag chew at 28 wpm delays the onset 
of high speed by a couple of minutes depending on the temp in the shack.

With the big fan on the back *off* my idle temp is 31c with *no* the 
helper fan, with the helper fan wired to the radio which runs when the 
radio is on the idle temp is 24 c it pushes the air from the top inlet 
through the unit and out the back. Noctua fans sit on soft silicone pads 
no vibration no sound just moves the air along through the amp.

Its to bad a replacement fan for the KPA500 from Noctua can't be found 
these are well engineered fans moving more air and quietly.

Regards
ka9zap
Art
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