[Elecraft] Need +12v or +5v on TX

[Robert Bajuk]

Hi,

I am adding kind of RF limiter/protector to my my K3 signal path at the
ANT1 input  and need to switch a small relay between TX/RX line. I would
like to keep protector circuit in small box inside the radio.
Where would be the easiest point to "steal" '+12v or +5v on TX only
(irrespective of the power settings, with or without KPA3). I know I could
use signal from Key out jack (active low) but I would rather find a point
inside the radio to switch relay with positive voltage and keep Key out
free.

73 Robert, S57AW