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There was one filter cap problem endemic to the CTC-25 chassis (and possibly the CTC-17 also, though I never saw it in a '17) that tended to crop up when the sets were just out of warranty. A multi-section can had a 680 (possibly 560) ohm, half-watt resistor between two of its lugs. The sets would come in with that resistor smoked. Turns out that one section had gone bad, allowing a large ripple voltage to appear across the resistor that overwhelmed its wattage rating.
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