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Regarding a Zenith roundie, the very first thing I would determine is whether its 'efficiency' coil is wound on a brown phenolic form (good) or the later whitish, semi-translucent plastic form (bad). If the latter, I would absolutely pass on the Zenith. The form crystalizes and falls apart from heat and age, This detunes the coil, causing the H.output tube current to skyrocket, rendering the TV set unusable. And those coils are near-unobtanium.
(The blue coils on the convergence panel usually suffer the same crystalization problem.) Earlier Zeniths used phenolic forms here as well as in the eff. coil (good).
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