Hi all, I bought a L-75 amp and in checking it out tonight I found that it would not make any power on 15 meters. Other bands 160 through 20 work fine. On 15 the input SWR is flat as it should be and the tube will draw almost .300ma with 50 watts drive but will not dip and there is ZERO out put power. Anyone have experience with this? Thanks & 73 Jim W8DRZ