Euro 3900 Channel Modification
Remove the bottom cover, be carful not to pull the speaker wire out. There is a black plastic rectangular plug (CN5) which is in the front center of the radio right in front of the gold colored crystal. Using small needle nose pliers, pull the plug off and reinsert it in the next slot. You now have the 11 meter band on Band D. NOTE: You also have to pull out the calibrate knob to get the extra channels.
Euro 3900 Power Mod
Locate the trim caps labeled "AMP", "MOD" AND "SSB". Turn these adjustment screws all the way to the right. These caps are on the same board as CN5, but on the oppisite end.? Thats all there is to it. You should see around 15 watts on AM and 25 watts on SSB