Posted by Wayne Parham [ 75.50.20.25 ] on December 30, 2006 at 12:21:11:
In Reply to: Zenith 9-S-262 posted by lyckland on November 03, 2006 at 09:26:46:
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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