Wayne Parham Messages: 18747 Registered: January 2001
Illuminati (33rd Degree)
Do you have an oscilloscope? If so, check the IF oscillator and alignment of the IF stages. I've had a couple radios with bad IF coils and the symptoms are exactly the same as you've described. All tubes good, all caps good, just a hum in the output. Without an IF oscillator, there's no way for the signal to get through the IF stages. So check the trimmers on the IF coils, make sure they're aligned, and make sure the IF oscillator is singin'.
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