Few days later I changed the coils in the lowpass filter. Almost doubled the inductance from the RFsimm calculated values. Also thicker wire used 1.2mm . And the Spraque C's replaced by an Arco 80pF compression type trimmer. Now the heat developed is much lower and the efficiency increased to about 50%. Great tool RFsimm99 but still I need to do the old solder work to change real components and test again. Now the only wish is having a bit more gain it needs >10W drive for full output. I can not let out the 1Ohm parasite stopper at the gate. If so i see oscillations. I tried a wire trough 1 ferrite pearl with 3 ferrite rings no drive power came through! 1 ring i had power but the ring got hot! Messured 1 wire gives about 70nH (at 500kHz) Those tiny rings do a lot more then thought! The BLF177 takes a lot RF gate current at low impedance. A few days I let it rest it was useless to continue the trial ...
Ham radio in JO33hg31 53.15N 6.35E