?

Here's the knob from my S-38, probably early as it has a metal bottom
plate. The inside of the knob is labeled "15-A-058" or "15-A-056,"
although I don't imagine that matters.

It sounds as if your knob is a close substitute, Richard.

73,

Maynard
W6PAP

On 11/17/24 12:59, Richard Knoppow via groups.io wrote:

I had to make a couple but had to guess as to how it was configured.
Same knob used on the S-40 and S-40A. fits 1/8" shaft and has some sort
of stop pin to work with the bent out tab on the front panel hole for
the BFO shaft. I made a reducer from a short length of 1/4" tubing that
had the right internal diameter (1/8"). Cut a slot in the tube to clear
the set screw and just cemented a small nut inside the skirt to act as a
stop. You must adjust the BFO for center frequency using its screwdrive
slot. Use the signal generator you use to set up the IF. When its set
put the knob on and tighten the set screw. The depth of the knob has to
be right to make the stop work right. A bit tedious.
I have never been able to find a genuine knob so I don't know if
they were special or a regular knob with a fitting. My knob works and
looks OK but is really rather a makeshift.
The same knob may have been used on other receivers.

On 11/17/2024 12:00 PM, Fraser via groups.io wrote:

The CW knob on the S-38 I just bought is missing. ?Is there anything
special about that knob, or is it the same as the others? ?I see that
the shaft has threads unlike the others.
thanks, Fraser, W3UTD

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998