Having trouble with a Westinghouse radio

[bob91343]

First measure all the plate and screen voltages. My guess is that the local oscillator isn't oscillating. I had a Harman Kardon like that, which had separate power supplies for AM and FM; the FM was running low and the local oscillator would quit near the top of the range.

The circuit of your unit is pretty standard. Check the local oscillator if you can (it's running at 100 MHz and up so ordinary meters are no good for that). If it's old, the tuning capacitor may have corrosion at its contacts. Spray the spring fingers on the rotor of the FM oscillator section. See that adequate power is reaching the tube. I don't have the diagram in front of me, but the oscillator often is a separate tube, like half of a 12AT7. Sometimes it's a pentode.