Pierre, that is a K6XX SMD Visible LED CW Tuning Indicator circa Nov 2004.
The purpose is "As you tune through a noisy band, you will find that the
Tuning Indicator LED will lock onto received signals, and the LED will
change from periodically illuminating dimly to lighting more brightly."

Randy, K7TQ, proud original owner of a KX1
Moscow, ID

On Wed, Apr 9, 2025 at 6:31 AM Pierre Desjardins <ve2...@gmail.com> wrote:

> Hi folks
>
> I recently came across an early KX1. There is a mod that I would like to
> know about. I joined this link to a photo of it. Four wires were
> soldered to the PCB, Can anyone can describe that mod? Thanks to all!
>
> 73 de VE2PID.
>
> Link to the picture:
>
> https://imgur.com/a/mkx5mHR
>
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