I sent an email to Elecraft support; an errata to the owner’s manual now specifically mentions this issue:
"During heavy use, you may hear audible clicking sounds, particularly as the amplifier components cool down. This is normal. It does not indicate that the amplifier is being overly stressed.” The errata can be found here: http://www.elecraft.com/manual/E740150E KPA500 Owner's Manual Errata C4-2.pdf 73 de Sebastian, W4AS On Jan 27, 2014, at 3:54 PM, Steve AI9T <st...@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-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Steve AI9T >> Sent: Monday, January 27, 2014 1:05 PM >> To: elecraft@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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
