[Elecraft] K3 always 100 W

[Keith Trinity WE6R]

It could be D36 & 37 on the RF board. Earlier ones (1st few thousand) 
had weak components. But any of them can fail and usually there is 
runaway power out.
If that is not it, look for burned components under the KANT3 board 
around T4 or on the underside near D36 & 37 look for burnt traces.
If it is older than about #5500, it could be front panel tin pin 
oxidation, replaced them with gold.
Keith