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Perhaps it will kill the tuned circuit and not work (is there some risk). Depending how it is wired in the circuit. The low forward voltage of it will kill it if it works with low bias. And, will not be effective at action, being too resistive and killing the Q, or not varying the capacitance in the needed range.
I recommend a silicon diode here at least (the first varicap ones are simply some selected diodes from another application).
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