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You need a coil that will resonate with the connected capacitance, consisting of C53 (1.5 pf) plus whatever the input capacitance of the 6AU6 sound IF tube is. So, guessing total C is between 1.5 pf and 5 pf, that would be somewhere in the range of 25 to 83 microhenries (and probably toward the lower side, depending on the 6AU6 capacitance) if I did the math correctly.
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