Ken,
Did you set the bias properly? What is the current draw at 12 watts?
Did you properly balance and calibrate the wattmeter?
Are all the diodes oriented properly? Check against the parts layout
near the back of the manual.
Make certain the fan is mounted with the label out and that the red wire
is in the +hole and the black one in the -hole.
The fan should exhaust the hot air. Cooler air flows in at the front of
the heatsink.
73,
Don W3FPR
On 5/19/2017 8:01 AM, N4KS via Elecraft wrote:
I recently added the KPA100 to my K2. The heat sink gets VERY hot at any power
level above 11 watts (that's when the amp kicks in). The fan is running at high
speed and pulling air OUT of the box. Just wondering if this is normal.
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