So far for the short time I've had the 1500, I've used it very heavily in WPX
CW recently. At constant running , sometimes getting no answers which is
probably max duty cyclefor this kind of operating, I never went over about 74
degrees C which kicks in fan speed 3 (I think, hi, I had it manually on 3
anyway in this situation and of course 1500 watts).
BillK3WJV
On Saturday, June 2, 2018, 6:47:03 AM EDT, j...@kk9a.com <j...@kk9a.com>
wrote:
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
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