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My 19" RCA CTC185 XL-100 color set also makes a very noticeable "thud" sound when switched on. It is indeed the degaussing circuit--they all make this noise at power on, and as the previous poster noted, it is no cause for alarm. If the buzz were caused by the set's power supply (bad caps) or vibrating laminations in a transformer (for instance), you would hear it all the time. As long as the set works, I'd just ignore the noise.
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Jeff, WB8NHV
Collecting, restoring and enjoying vintage Zenith radios since 2002
Zenith. Gone, but not forgotten.
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