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The Zenith vertical output transformers have a habit of developing shorts between the primary and one of the convergence windings, which essentially shorts the vertical stage B+ to ground through all the low resistance parts in the convergence circuits. For whatever reason the insulation on the wires as well as the paper tape materials break down. I had this failure on a CTC-5 as well, due to the way the windings were done it allowed all four secondaries to short to B+, which smoked all three DC convergence adjustment pots. I have already rewound that transformer, and is working, just need to find a working substitute for the three pots (100 ohm with a tap at 75%).
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Erich Loepke
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