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Also, since all the bias voltages look normal and you indicated the BPF and Phase and balance adjustments all worked normally, it means signals are getting at least all the way up to the input of IC10 section A. Do you have an oscilloscope available? You can put the radio in BPF test mode on menu 8.7 and trace the 700 Hz audio signal through that stage ... and previous stages if necessary. ALSO, you can use a small amplified speaker to trace back from the earphone jack and maybe find where the audio is disappearing. ... 73 .. Ron