In my Novice days many years ago I owned an SR-75. It
was indeed an S-38 that used the audio output tube (35L6
or 50L6 (?) as a TX oscillator with a plug-in coil that was
reached through an opening in the back cover. Had no way
to measure the output power, but it wasn't much.
The original S-38 (only) has three slide switches in the
lower left corner of the front panel. The third switch is for
a diode noise blanker, and only appears on original S-38's.
FWIW …
73!
Ken Kopp - K0PP
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