KM1H wrote: "Any amp covering 160-10 should have at least a .0047 added in parallel with whatever is there" Very interesting. I added 160 meters to my homebrew 80-20 amp. To my original 90 uhy plate choke I added a second 90 uhy in series. To my original .0047 bypass cap I added a second .0047 in parallel. The amp works great on 160 meters. 73, Ken W2DTC