In general, I've had trouble finding original Hallicrafters knobs.
They are a unique design or rather several designs. On the S-38 and some
other receivers, like the S-40 series, there were tuning knobs that look
similar but have differences, for instance the metal rings that are on
some but not others. Another toughy to find is the BFO knob on the
original S-38, also used on the S-40/A and maybe others. This fits on a
1/8th inch threaded shaft and has a stop that fits a tab on the cabinet.
I have had to makeshift them from standard small H knobs. Also, H used
slotted set screws on some knobs and Bristol head on others. One learns
not to expect consistency in older H gear.
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On 7/30/2024 7:43 PM, Maynard Wright, P. E., W6PAP via groups.io wrote:
On mine, the set screws are almost flush with the surface of the knob
flutes when tightened. Since those set screws are connected to the
chassis, meaning a metal shaft, it might be possible to receive a shock
by pressing your finger tightly on the set screw hole.
I don't plan to test that and I have no idea whether or not the screws
are the originals or some longer ones that someone used sometime in the
past.
73,
Maynard
W6PAP
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
