[Elecraft] KPA3 failure?

[Joe Subich, W4TV]

Pete,

Sounds like a low power amplifier failure.  Call Elecraft Support to
discuss but I suspect they can send you a board to swap.

73,

   ... Joe, W4TV


On 2015-02-05 8:05 AM, Pete Smith N4ZR wrote:
> My K3/100 #4275 has suddenly stopped making 100 watts, and is now making
> 10-20 on 160-20 meters, and 45-50 on 17-10 meters , even though the
> power control says it should be making 99 watts.  On the way to its
> current state, it cycled once through reduced power and back to full
> power after a band change, so I suspect something was in the process of
> failing.  Any ideas where to start troubleshooting, or is this something
> that warrants a trip back to the mother ship?
>
> Addendum:  In further testing, with power turned below 10 watts to
> disable the KPA3, I'm now seeing less than 1 watt on 160, 8 on 80, 8 on
> 40 and 11-13 on 20-10.  Turning the power back up to 100 watts, I now
> have 20 watts on 160, 35 on 80, 25 on 40, 50 on 20, 85 on 15 and 100 on
> 10m.
>
> Should I first try recalibrating the TX gain?