[Elecraft] KPA1500 Fan Noise Video posted

[john at kk9a.com]

Nice video Don. Speed 4 and 5 might be like trying to operate with the XYL
vacuuming around you. I wonder what duty cycle and power level it takes
for these speeds to kick in. It was good to see a comparison with the tube
amps. My Alphas were hardly noticeable when running but remember they are
significantly larger and do not require a 3, 4 or 5 fan speed setting.

John KK9A


Don Butler n5lz wrote:

In response to N5ZC’s request  I just made this short video to provide a
listen to the KPA1500's fans ... at least as they sound in my shack. 
Follow this link to view: https://vimeo.com/273064144

In addition to the KPA1500 the video also includes footage of my Alpha
9500 and Icom PA1 … each running with their fans at maximum speed … to
provide a simple rather crude comparison.

What do I think?   I think that fan speed 1 and fan speed 2 on the KPA1500
are probably comparable to the fans that are installed on the other
amplifiers as far as sound and efficiency are concerned and likely provide
a similar degree of cooling at those speeds.   And, I think that fan
speeds 3, 4, and 5 (which are indeed noisy) provide the KPA1500 with
enhanced cooling capability that is simply not available on other
amplifiers.

Don, N5LZ