Heathkit SG-8 Manual page 19

as follows:
(1) Use of an antenna coil rather than a rod-type or loop antenna.
(2) Use of a separate oscillator rather than a pentagrid converter.
) Trimmer tuning of IF and RF stages in place of iron core slugs.
(4) Use of an RF stage ahead of the mixer.
) More than one IF stage.
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Page 17