[Elecraft] KPA500 Clicks

[AG0N-3055]

On Mon, 27 Jan 2014 14:27:59 -0600, Dave Perry wrote:

> Steve,
> 
> My KPA500 also has the clicks and pops as it heats up and expands.

I'm rather curious about this clicking people are talking about.  I have
SN 1255 and have heard none of what is being described.  I've purposely
heated it from cool to in the 70s where the fan kicks into warp speed.
At first I was ready to jump in with my "clicking" experience, but it
was true clicking, not ticking that others seem to be describing.

My clicking experience was rather short lived and I attributed it to a
poor RF situation with my six meter antenna.  For a short time, I would
sometimes get a relay click and rather high VSWR indicated when on six.
I replaced a few jumper cables and all was well again, including the
output of the KPA.  It got even better when I got that Mother's Fine
Junque tuner out of the circuit and installed the KAP.  It's nice to see
just about the same reflected in both units now on the lower bands.
Before, I could get the tuner to show zero reflected, but the amp
didn't.  Sometimes I would slightly off-tune the tuner to get the amp
down better.  Don't get me wrong.  All readings were under 1.5:1.

Anyway, I sure haven't heard any heatsink ticking at all, even when it
was brand new.

Just another person's experience for reference.

Gary - AG0N
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