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Have you considered a possible heater to cathode short in a stage prior to your baseband video injection point? That is the Tuner through the Video IF. A heater cathode short could inject the hum and could create a higher current draw if a stage is dependent upon a cathode resistor bias arrangement. And a partial short is sometimes not obvious in a tester.
Terry
Last edited by Penthode; 09-15-2011 at 01:15 AM.
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