[Hallicrafters] SX-71 Pitch control shaft.

[Julian Bunn]

Hi Skip,

Thanks. I have found a long bolt in my parts box that has the same thread and diameter as the shaft on the control. I'm hoping I can
use that, perhaps by attaching with a small bushing and glue/solder. Unfortunately I do not have a lathe :-(

Julian 

> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net 
> [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of 
> Waldo Magnuson
> Sent: Thursday, March 31, 2005 8:14 AM
> To: hallicrafters at mailman.qth.net; julian.bunn at caltech.edu
> Cc: Waldo Magnuson
> 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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