This was my first receiver, and was a lesson in patience as many first receivers are. Common to 455 KHz single conversion receivers, the performance above about 12 MHz is really poor, and the S-38D is no exception. This receiver is really an "All American Five" at it's core, but with a front end modified for the extended frequency coverage.
The "BFO" consists of a gimmick capacitor causing the IF stage to oscillate.
The front end coils are wound on 2 forms, 1 for the RF, one for the LO. Therefore the bottom end of each band is unadjustable.
This receiver is okay to a degree for casual listening, and can be fun to spin the dials on, but it isn't a great performer, especially if compared to more modern receivers. A quick glance at eBay reveals many of these go for between $20.00 to $60.00.
It goes without saying that if you come into possession of one, it is highly suggested that due to it's age you have it checked out by a competent radio technician.
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Based on historic data, today's second-hand price of the Hallicrafters S-38D is around: