As noted in the current KPA500 manual, this is normal and can happen after the
heatsink has been heated up. As it cools the different metals in KPA500 case and
heatsink contract at a different rate, causing the slight ticking that is
occasionally heard.
73,
Eric
elecraft.com
On 4/2/2014 3:15 PM, Jessie Oberreuter wrote:
This came up recently w/ the K3 as well, and perhaps a year or two back.
It /sounds/ like a tiny relay is clicking in the K3 on t/r switching even
though it's all solid-state. Wayne speculated that the sound might be coming
from relay springs re-balancing slightly in response to associated voltage
changes on the power rails. I don't believe it's been tested further. Perhaps
you're hearing something similar from the KPA500. -kb7psg
On Mon, 27 Jan 2014, zen...@netspace.net.au wrote:
FWIW, I've noticed these clicks from within my KPA500 too. I always
assumed they were thermal expansion and contraction of hardware within
the amp. I ignore them because they have
never been associated with any problem with the function of the amp.
Besides, I don't know how you'd begin to try to isolate exactly
which bit of metal in there is doing the clicking to be able to do
anything about it.
73,
John
VK7JB
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