working on brother and laws cobra 25 nw wx st . It will only key 3 watts but swing to 25. sounds fair on the air has 1969 final looks to be original. took out c6 no change removed tr14 I think that was the # no change. played with coil would get worse but not better. Is this common for this radio. Any info on mods would be great. driver looks to be stock. Thanks.