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Zenith used that design thru the first generation system 3's. Beginning with the 9-160 module sets, they dropped the transformer. Everybody figured out it was cheaper to use solid state regulation instead of using a large transformer.
Some of the solid state switching power supplies in TV's could be difficult to work on. The easiest SS power supplies in TV's to troubleshoot were the sets that used an
STR30xxx regulator IC.
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