[Elecraft] KPA500 Clicks

[Steve AI9T]

Hi Dave

I didn't know that Elecraft had a fix for this. I will send Tech Support 
an email and ask them about it. My Amp is fairly new. I built the kit 
last May. The serial number is 1469.

-- 
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 1/27/2014 3:27 PM, Dave Perry wrote:
> 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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