The Gonset converter worked fine: it was the car radio which was
wholly unsuited for the task. But they are fine for BCB DXing if the
IF is narrowed down, or as is, given a good antenna, for audiophile
AM.

Best is an aircraft ADF set. New ones are several thousand dollars
but old tube and non-TSOd early SS types may be had cheaply. I got a
huge pile of tube and early solid state avionics-dynamotors, tuner
assemblies, and all-from a FBO who was grateful I'd haul it off.