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Quick post-script. In my basement I stumbled across a modulator that I didn't even know I had - an RCA model CRF907R. Simple and compact. Must have purchased it many years ago. So, I tried it with the TV, and the buzz is almost gone. The audio is a bit quieter - I find myself turning the volume almost all the way up - but the buzz is noticeably reduced, almost totally gone.
I have ordered a few more of these units on eBay, basically new/old stock. They seem to be readily available online. So, if anyone else faces this problem, I recommend trying the RCA CRF907R modulator.
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