Thanks for all comments so far.
As many have suggested, my test set-up was suspect due to a possible ground
loop. I repeated the test with a 3-prong to 2-prong adapter on the scope power
plug to make its chassis floating. Interestingly, the 60 Hz ripple was still
present on the measured signal!
To K9YC's point, I will try to locate a bad filter cap. Thanks for the
suggested method. BTW, your Titan schematic is fantastic! Everything on a
single page makes tracing a signal path so much easier.
73 & HNY,
Wayne, W0ZW
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