[Hallicrafters] SX-99 / SX-100

[TC Dailey]

I could be mistaken, but I'm almost sure that knobs from an S-38 will work
for that... they look the same, and are either very close to size or
exactly.  ...s'worth a try.  Also - I cannot recall how much "web" you have
inside your knobs, but if there's enough, I've drilled out the center, and
epoxy'd in an aluminum bushing that was 1/4" ID, with a threaded hole on the
side.  Match the bushing's hole up with the existing knob's hole, and you've
saved an irreplaceable knob.

SX-99's and SX-100's were the "dancing queens" of microphonics.  We had one
in highschool that would "sing" a nice tremollo everytime somebody walked on
the floor (and it was a CONCRETE floor!).  I've fixed a few receivers by
loosening the hardware (one piece at a time), then retightening it -
obviously, it's usually a cap or tube, but wires hanging in space can do
that as well.

G'luck  Tom  WØEAJ