Re: Advice on output transformers
I think that is simply a 9-pin plug with a U-cable clamp and de-emphasis resistor/capacitor that plugs into the decoder socket when the decoder (presumably an option?) is not fitted. The resistor/capacitor serve to correct (de-emphasise) the rising response (pre-emphasis) used in FM transmission to achieve good signal-to-noise ratio. That would explain a lack of stereo light.
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