Hmmm ... Tight screws yes. Beyond that, I'd be somewhat wary of re-engineering the thermodynamics of the KPA500 ... OK, very wary. I have a KX1, K2, K3, P3, and KPA500. They all have one thing in common: Elecraft equipment is very carefully and meticulously engineered -- electrically, mechanically, and thermodynamically. My 500 on RTTY at 500W stabilizes at about 69 C. The fan seems to come on high [the only speed I can hear with the cans on] at 70 C, and it does occasionally but the temp drops immediately and it cycles down. I'd check with Elecraft Engineering before changing anything.
73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org On 6/18/2012 4:42 AM, David Robertson wrote: > The fix. > > I removed the top, front, and right side panels of the KPA500. When I first > built the linear I realized the mounting screws that mount the Z panel to > the amplifier module were too long so I used the shorter ones that would > normally go to mount the top panel. On inspecting these screws they were > tight. Looking at the right panel I noticed there are 4 screws that mount > the panel directly to the amplifier's heat sink. They were not as tight as > I would have liked. I wanted to get the most efficient heat transfer from > the module so I carefully applied some heat sink compound to the side of > the heat sink of the amplifier module before carefully mounting the right > sied panel back on the amplifier. I carefully made sure the 4 screws that > mount from the panel to the heatsink ( which are normally covered by the > handle) were solidly and carefully tightened. After inspecting the > transformer connections and the rest of the inside of the linear I > reassembled it and tested it out. ______________________________________________________________ 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
