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I've seen several of them with a pair of 6V6s or a pair of 6BQ5s directly on the TV chassis. I'll have to think hard about it to recall makes & models. It seems to me I've seen definitely some 50s Zenith B&W sets with dual outputs and bass/treble controls, also Packard-Bell, Hoffman, and maybe a few early RCA console B&W sets with such.
Let me say I can't guarantee that some/all of those were push-pull; Could have been dual tubes in parallel.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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