[Elecraft] KPA500 Clicks

[Dave Perry]

Steve,

My KPA500 also has the clicks and pops as it heats up and expands.  As I
recall, Elecraft offers a fix for this.  The fix involves replacing the
metal screws that fasten the heat sink to the chassis.  They had to go with
a larger screw to obtain a tighter hold on the bracket for the heat sink.  I
assume this has been fixed in newer models.  My serial number is in the low
200s.  I have never bothered to install this fix, but the clicks do get
annoying at times.  Is this fix still available?  I would think that you can
search the archives for a discussion on this topic right after the amp came
out.

73,

Dave, N4QS

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Steve AI9T
Sent: Monday, January 27, 2014 1:05 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA500 Clicks

Thanks for all the comments on the KPA500 Clicks. Looks like I'm not the
only one that has noticed it. I guess I won't worry about it.
I have had the AMP for a few months now and have been very satisfied with it
so far.

Thanks again!

--
73

Steve AI9T

http://www.ai9t.com

AI9T DX Cluster

Version 4 AI9T   Telnet: dxc.ai9t.com port 7300
Version 6 AI9T-2 Telnet: dxc.ai9t.com port 7373 (CW + Skimmer)


On 1/26/2014 3:03 PM, Steve AI9T wrote:
> During a couple recent RTTY contest I have noticed that my KPA500 is 
> making a noise. It kind of sounds like a relay clicking in and out.
> When I first noticed it I thought it was a fan relay or something to 
> do with the fan. But after hearing this longer it seems to be related 
> to the temp.  It clicks in an out around the temps of 62C and 56C. It 
> kind or reminds me of an old radiator warming up and cooling off. I 
> took the cover off yesterday and checked the nut that holds the 
> transformer in place. I thought maybe that spring washer might be a 
> little loose but it wasn't.
>
> Anyone else ever notice this? Hopefully it is not a serious problem.
>
> Thanks
>

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