Re: Station Radio C-12
Remember that the likes of the C12 were designed to be used mobile in tanks with just a single unloaded 12 or 16-foot whip antenna, rather than a longwire or dipole. So by design they have plenty of front-end gain! Hooking one up to decent antenna like a longwire or a 1/2-wave dipole can be expected to cause overload.
It may be worth seeing if you can increase the amount of BFO coupling to the detector-diode: there's usually a [very small value] capacitor for this - replacing it with a trimmer-capacitor would allow you to vary the BFO injection until you found the right amount.
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