I have one and the sd1446 is bad I didn't have a spare one but I did have a 2290 and on ssb it hits 100w no problem but on am it hit 40 if I turn dk up from 1.5 to 3 or 4 it just max's out to 40 with no swing now im sure I need o change maybe an input resistor or output one not sure has anybody used a 2290 in one of these?