Posted by
k6dgw on
URL: http://elecraft.85.s1.nabble.com/KPA-500-tp7557770p7557792.html
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.
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