🚀 go-pugleaf

I have heard of others with the same trouble,  a  wavy  line
walking  up  the  screen,  so I'll broadcast an answer.  The
problem seems to be a "retrace snake".  This would be caused
if  the ATARI were superimposing 60Hz onto the video signal.
You might note that the frequency exhibited by  the  "snake"
is  that  of  the difference between 60Hz line frequency and
the vertical refresh rate which is quite close.

Look for any source of 60Hz. Bad grounding  is  certainly  a
candidate;  but,  the  most likely culprit is something gone
bad in the ATARI's power supply. If you have access  to  the
appropriate  tools,  check for either a bad rectifier, a bad
filter cap, or a bad regulator. If you're  lucky,  there  is
even  the  possibility  that the problem is as simple as the
end of the video cable that is plugged in  INSIDE  the  case
has partially worked loose and needs only to be reseated.

Please let me know how you make out.

Ron Perloff
Burroughs Corp
16464 Via Esprillo
San Diego, CA 92128
619-451-4519