13-06-2022, 12:40 PM
There aren't components either side?
Often that largest one is in series with VHF aerial, which is either a trailing wire or telescopic. If that's the case then clipping a wire to the RF tuning cap (1 in 4 chance of right pin) will do as an aerial to test.
A decent valve FM set tuned at about 87.5 to 97.5 MHz will pick up the transistor LO if the aerials are interconnected. Tune faulty set across entire band at each 0.5 MHz of 87.5 to 101 MHz to find the transistor set LO and then you can adjust the LO. It's which ever coil moves the frequency.
You should be able to get the other coils OK and LO tuned without the big coil if it's just in the aerial circuit.
Often that largest one is in series with VHF aerial, which is either a trailing wire or telescopic. If that's the case then clipping a wire to the RF tuning cap (1 in 4 chance of right pin) will do as an aerial to test.
A decent valve FM set tuned at about 87.5 to 97.5 MHz will pick up the transistor LO if the aerials are interconnected. Tune faulty set across entire band at each 0.5 MHz of 87.5 to 101 MHz to find the transistor set LO and then you can adjust the LO. It's which ever coil moves the frequency.
You should be able to get the other coils OK and LO tuned without the big coil if it's just in the aerial circuit.
