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During early TV design, engineers often incorporated circuits to remedy theoretical problems. As designs progressed, such unnecessary precautions were omitted to improve cost and reliability. The CT 12 volt filament was to minimize hum and reduce the wire size necessary to interconnect the tubes. Those tubes closest to the transformer would need wire gauge similar to the transformer winding. Once tube count was reduced, it was no longer a consideration.
The RCA 630 is an example of overkill.
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