[Hallicrafters] SX-96 / SX-100 Broadcast band oscillator coil

[Barry Hauser]

Randy Rysavy writes:

> I'm new to the list. Is it OK to inquire for parts for an SX-96?  I 
> am trying to get mine back fully functional, but determined that the 
> broadcast band oscillator coil (L14) is out - opened between terminals
D & A.  
> Seems sort of unusual for this go out.  I have inspected the coil and
see 
> no obvious broken wires etc, so it must be bad deeper in the coil 
> windings. 

<snipped>

Randy -- 

Before zapping the coil -- if you haven't already tried this -- refresh
the solder connections where the coil wire ends go to the terminals.  Use
some fresh solder and go easy.  I'm told that a common failure point for
coils is at the solder connections, even if it's not an obviously broken
connection.  Solder connections can very gradually deteriorate due to
mixed metals, flux residues that didn't originally boil off, varnish,
etc. inside the joint.  (Visual inspection won't detect it -- the joint
doesn't go dull or crystallize like a "cold solder joint" when originally
made.  Coils, what with litz wire and/or thin enameled wire are more
prone to hidden corrosion than usual.  It takes only a very thin film of
contaminant to do the deed.  In some cases, it will create a resistor or
capacitor, or even a diode, if not an open connection, so I'm told.  If
freshening the joint doesn't work, I'd try the high voltage approach as
suggested.

Barry

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