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: [email protected] [mailto:[email protected]] On Behalf Of Steve AI9T Sent: Monday, January 27, 2014 1:05 PM To: [email protected] 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
