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Hi, The four irf520n that i put into my kl203 amplifier instead of putting out about 80 watts only managed 30 watts......they were unbranded items so i have ordered four international irf520n from them....hoping for a bit more output.................. jim

PA The 4 finals are mosfet devices just ordered them on ebay £8.00 total so definitely worth repairing the amplifier....... Do you not agree ????? jim g4rek

I've just blown the 4 pa mosfets all dead short.....took one out a real pain as it was so so tight in printed circuit board.....so i have carefully cut the leads on remainder close to the mosfet devices.....and intend to solder the new ones when they arrive to the remainder of the old...

203 AMP Hi, I have a Yaesu 2100b linear that i sometimes use...... the 203 amp is okay with bandpass filters on each band and some bias for ssb use its a nice project to work on and cheap.....of course there are many alternatives to play with........ Jim G4REK

Hi, Wonder if anyone else is using the 203 amplifier ???? mod done with 500 pf cap in place of C14 works fine on 60 meters/40 meters/20 meters...... not tried on 18 megs yet.....need bandpass filters......puts out 130 to 150 watts ssb with only a few watts of drive. Jim G4REK

HI, WONDER IF ANYONE ELSE IS USING THIS AMPLIFIER?????? i HAVE DONE THE MOD AND IT WORKS REALLY WELL ON 60 METERS AND 40 METERS AND 20 METERS PUTTING OUT 100 T0 130 WATTS .... JIM