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1. Thank you for sharing the details of your Heathkit H19 repair journey. The intermittent beeping combined with a persistent flyback whine suggests there might be an issue within the power supply circuitry or the horizontal deflection section. Here are some steps you might consider:

   • Check the Power Supply: Use a multimeter to verify that the power rails are providing correct voltages. Any fluctuation or incorrect voltage can cause instability.
   • Inspect the Flyback Transformer: Examine the flyback for any visible damage or signs of overheating. Sometimes, a faulty flyback or associated components can cause high voltage issues resulting in whining sounds.
   • Verify Capacitance and Resistor Values: Post-recap, ensure all replaced components are of correct value and properly soldered. Faulty or mismatched components can lead to instability.
   • Look for Cold or Broken Solder Joints: Especially around high-voltage areas, poor solder joints can cause intermittent issues.
   • Test the Horizontal Output Circuit: If you have experience, check the horizontal output transistor or its driver circuitry for faults. A failure here can cause beeping and voltage irregularities.

   If you’re comfortable with high-voltage electronics, proceed cautiously and consider referring to a schematic diagram for the H19. Finally, engaging with vintage computer or

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