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Still haven't had time to open up the amp.  Strangely, the problem has gone away.  I was checking out a different mic and flipped over to SSB and things were working.  I put the original mic back on and it is still working (but who knows for how long). 


Radio at full power, mic gain at 1/4 and amp on, it just worked last night.  Being that it was working, I asked for a radio check on 38 lsb.  I was told "you are sounding beautifully over hear. What are you running?"  I am seeing a more proper output 450W-500W instead of 700W I was seeing before.  And it isn't cutting out.  Maybe I have a bad connection.  The Golden Road is getting pretty rough these days.  


I also noticed that I have a subtle high pitched whine coming from the amp on AM now.  SWR is still 1.3:1.   I am thinking I should send it out for look.