[Elecraft] Problem for K2 # 4498

[Robert DROGOUL]

Hello the list !
I'm calling "Au Secour" after a problem that I tried to solve without 
results.
With power down to zero, on all bands, there is no output BUT I get a 
very healthy signal at about 450 khz up to the firlter input. When I 
start to increase power, up to about 7 to 8 watts, the output signal 
is shopped by this 450 khz "carrier", and when the power can be pushed 
over 10 w the 450 khz disapear completly. (On 1.8 output max is 0.2 w, 
3.5 5 w, 7 12 w 10.1 8 w, 14 10w, 21 7 w, 24 6 w, 28 5.5 w. All 
transistors where changed ( 2N5109, 2SC2166, 2x2sc1969)without results 
so...
Does anybody had this situation ?

Thank you in advabce
F5UL/Bob