Hello, I have an M175 that I just replaced the MRF455 with Ma-COM 455s(matched received from reputable source in SD). It is acting peculiar. The SWR is only good 1.2/3 on low. . Up in the 3 area on Med and High. Also any modulation on med or high results in the keying relay clicking. My SWR meter is after the M175. I have tried 6ft and 8ft jumpers between the radio and assistant with similiar results. My dead key is set between 2-3W. It runs another 2 455 and 2 1446 just fine(no swr issues). I have read the other posts(high swr with amp on) I understand my amp tune could be wonky. Most likely is for that matter. Do not know how to experiment with that tune but would guess the var cap in there has something to do with it. Some of the information is a little confusing. Going to check all resistors etc. Just checking if anyone else has experienced this? Thank you.