[Hallicrafters] SX-71 Pitch control shaft.

[Peter May]

Hi Julian,
I've encountered the same problem with the SX-71 CW control shaft.
It seems to be a weakness with this model as they seem to get broken/bent
during storage or transportation.
Fortunately I was able to straighten the bent shaft on mine.
My SX-71 is the next cab off the rank as far as a full restoration goes. My
motto however is:  "if it aint broke, dont fix it".
This upsets some of the more dedicated enthusiasts.

Regards
Peter May

Perth, Western Australia
----- Original Message -----
From: "Waldo Magnuson" <magnuson at mac.com>
To: <hallicrafters at mailman.qth.net>; <julian.bunn at caltech.edu>
Cc: "Waldo Magnuson" <magnuson at mac.com>
Sent: Friday, April 01, 2005 12:13 AM
Subject: [Hallicrafters] SX-71 Pitch control shaft.


> Hi Julian,
>      The CW control shaft on my SX-71 was broken too when I got the the
> receiver.  I removed the assembly and was able to remove the iron core
> with the brass screw in it.  I then drilled the screw in the core and
> turned down (step-down) a matching screw and mated the two together
> with some epoxy glue.  The drill was small (#58 I think) and the
> turning of the matching screw is delicate lathe work but not too
> difficult to do.  The end result fixed it like new.  Good Luck.
> 73,  Skip Magnuson  W7WGM
> -------------------
> Julian wrote:
>
> I'm resuscitating an SX-71 that arrived in a pretty poor state
> cosmetically. Electrically, from the limited tests I did, it
> seems to be OK.
> One problem is the CW Pitch control.  When I tried to gently straighten
> the shaft, it broke off ... I then
> removed the whole control, and disassembled it. The shaft is basically
> a screw thread with an iron core at the end, that moves in and out
> of the inductor coil.
> I'm wondering if I can perhaps simply break off the remaining short
> copper threaded shaft, and glue a longer replacement shaft onto the
> iron core piece? I imagine getting hold of a replacement knob is
> going to be hard.
> Thanks,
> Julian
>
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