[Heathkit] SB-300 LMO warbles

Tue, 6 May 2003 15:52:20 -0400

  Bill,

 The LMO tuning capacitor has a fork shaped spring contact that
provides a stable ground connection for the cap rotor, its located on the
rear end of the rotor shaft right in front of the rear bearing. cleaning
the
surfaces between this clip and the rotor shaft and increasing its
tension a bit by CAREFULLY and SLIGHTLY bending it
will more often than not correct this problem.

73,  Mark  WB8JKR

On Tue, 6 May 2003 13:46:47 -0400 Bill Evans <[email protected]> writes:
> I am rebuilding a SB-300 and the LMO is erratic when tuning.  It is 
> stable when I am not tuning,  With my frequency counter on the 
> output, 
> I watch it jump around plus and minus 40-50 Hz as I tune.  Since it 
> is 
> a slug-tuned coil, what can I do to make it smooth again?
> Thanks for the help.
> 
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