The first thing that is always recommended for this is to run the TX Gain Calibration in the K3 Utility.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/

On 19/01/2023 12:55, Mikael Larsmark wrote:
Hi,

I have 5 pcs Elecraft K3 in my shack and one of them, which is a very early
model (serial #1938) suffers from quite a power spike when transmitting.
You can clearly notice it on the amplifier and it is only this K3, none of
the others.

Can somebody give me some insight on this?

/Mike, SJ2W
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