> Alan, thanks for the note.  I finally heard from Digital 
 > Electronics, 
 > exactly a month after I wrote to them.  Sent me a letter with some 
 > suggestions regarding some diagnostic tests --- the results were 
 > inconclusive.  So I packed the unit up and sent it to them.  They 
 > charged me $35, said they'd put it through exhaustive tests, but 
 > could 
 > find nothing wrong with it.  Suggested I try a new cable, which I 
 > already had done.  Not too encouraging I'm afraid.  A power supply 
 > problem certainly sounds like it would explain things, but would 
 > have 
 > thought their tests would have spotted a bad rectifier.  I think 
 > I'll 
 > write them again with your diagnosis and see what they think of 
 > that.  
Not neccesarily -- a bad rectifier will often show up as good on a test 
becnh, especially one that fails only after a few minutes under load (like 
yours.)  For $35, they should have pulled the PS module and ran the unit with 
a new one for a while.  THy again and let me know --DEC is supposed to have a 
better reputation than this!
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