[Hallicrafters] Progess of the SX-100 Problem

[jackiv at juno.com]

Hi Ron, there is a reason that the resistor burned, usually a capacitor
(its full of the baddies) did you find a bad cap?
Yes, the second convertor is a bitch to remove, I wish that you could
remember what the "C" number was.
tnx  73    jackiv at juno.com

On Fri, 03 May 2002 20:44:36 -0700 Ronald Oberloh <wa0kds at yahoo.com>
writes:
> Removed the sub chassis today and found one resistor a 22K burned in
> half.  Because this unit is so hard to work on  I went through and
> checked all the resistors in the sub chassis before I reassembled it 
> and
> found one 100K as 125K and a 120K as 170K so replaced them also.  
> All the
> rest of the resistors were almost right on the money.   So after 
> getting
> the think back together I did the 50 Khz alignment on it and sure 
> had to
> move the slugs a long ways.  It seems like someone down the road 
> was
> trying to get this radio to work and totally messed up the 
> alignment
> doing so.  My experience with these old radios is that if you can 
> find a
> radio that was aligned at the factory  and the radio fails if one
> replaces the  bad part the factory alignment will still be right on 
> or so
> close it really will not make any difference.
> 
> I  still am not satisfied with the audio yet but don't think the 
> problem
> is in the audio circuit because I ran an audio generator and scope 
> on it
> and it looks very clean and goes from about 100 Hz to 3 KHz with 
> roll at
> both ends.
> 
> Tomorrow will put an RF generator to it and see what surfaces. I 
> expect
> it will be replace some caps that have turned into very small  caps 
> over
> time.
> 
> Ron  WA0KDS
> 
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