I have a Henry 2KD-5 that I am using on AM running 300 watts.
There is a low level but noticeable 120 Hz hum on the unmodulated
carrier in CW mode. The hum is super imposed on the AM signal
amplitude. Local stations can hear the hum. I have tried two
exciters and they are not the source. I have recapped the filter
capacitors to 250 mF without change in symptoms.
Is there something else to check or do I just live with the hum?
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Ron Schuster N9RC
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