[Elecraft] KPA500 Clicks

[Sebastian, W4AS]

Please post here if Elecraft confirms they have a fix for this.

73 de Sebastian, W4AS



On Jan 27, 2014, at 3:54 PM, Steve AI9T <steve at ai9t.com> wrote:

> 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