[Elecraft] KPA500 Clicking Noise

[Bob McGraw]

It is thermal expansion and contraction as the metal temperature 
changes.   When I first got mine, new from Elecraft, it had a case of 
the snap, crackle, and pop syndrome.   After a few weeks the issue 
disappeared.   Haven't heard it since and the amp is used every day.

73

Bob, K4TAX


Message: 9
Date: Mon, 20 Sep 2021 14:27:41 -0700
From: Dana Roode K6NR<dana.roode at gmail.com>
To: Elecraft Reflector<Elecraft at mailman.qth.net>
Subject: [Elecraft] KPA500 Clicking Noise
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I hadn't used my KPA500 for awhile, but I put it on the air recently.  It's
working fine with my K3, but after it warms up - 40 degrees C or so - I
start to hear a faint clicking noise.  It is coming from the vicinity of
the fan and heat sinks.  There is a click every 10 seconds or so, I think
whether I am transmitting or not.  Fan control is working fine, and I
bumped up the lowest speed to help keep the amp cooler.

Let me know if anyone has seen this before.  Meanwhile, I will keep using
it and see how it goes.

   Dana, K6NR