can you post the whole circuit?
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this is all i have but im 100% sure that this simbol was used before 80 years so i think it is capasitor...?
It is for the "air" tuning capacitor at the resonance circuit (radio antenna). I saw it in the old radio diagram and circuit, as well the air capacitor is obsolete now, the mica capacitor is used intead, it is much smaller and lighter.
nguyennam
I am not in Europe, but I think, as this kind of tuning capacitor (it must be high voltage) is obsolete now, so you may find it out at any store for the old transistor radio, old tube radio.