If your president lincoln is set for 20w pep on ssb then it will not be anywhere near that whilst talking,the zetagi b300p will handle that input easily as long as you don't start whistling through it and pushing the radio to its max.only thing i will say is don't put the b300p past level 5 as the fuses will almost definately blow at that input level,best compromise is using it on level 4 at that input level where it will run all day long with no problems,
i ran that exact setup every night for 6 months solid and the only time it blew a fuse was when my mate turned it to level 6 to see what would happen despite me telling him not too.fortuneately for him i always carry spare fuses for amps.the b300p has 2x10 amp fast/quickblow 20mm fuses internally.
before going to level 4 i would always give a few short keyups on level 2 on fm mode to preheat the transistors before putting it onto ssb and level 4.worked very well for us coupled with a sirio hp4000 mobile antenna,we were easily doing north and south america,carribean,anywhere in europe,asia,s.africa all with very good signal reports and excellent audio reports.
the biggest mistake most people make with a b300p is trying to screw the manufacturers specified output from them by increasing input power,it just won't do it and you'll melt the input attenuator circuit board.if it does 140w on level 4 be happy at that,its plenty to get you round the world even on a mobile antenna.
one thing you can do to improve the b300p is increase the size of the dc power leads by soldering heavier ones straight to the board,it will lessen voltage drop.the ones supplied on it are borderline.
rm italy amps show slightly more power but are dirtier than the b300p,if you add a filter to the rm amp then it will do roughly the same as a zetagi which tells you all the extra power on your meter is from harmonics or happy watts as we call them in the uk,make the user happy as he sees more power on his power meter but everyone in the vicinity very unhappy from splatter and rfi.
