I owned a FT2100Z for several years and the power on 160m was the same as other bands. I don't expect any design flaw. The original tubes are not available anymore, the 572's tubes manufactures nowadays are different and optimized for audio applications and does not perform at the same level as the originals 572's. You may just need more drive or change the input circuit for 160m.
Regards N4IS _________________ Topband Reflector Archives - http://www.contesting.com/_topband
