[Hallicrafters] SX-101A selectivity

[Rodney Bunt]

Hallicrafters.....

The same band-pass circuit is used in the SX-100 nad the SX-101, I have found the caps drift by up
to +50% and the are leaky too. I tested them on a Heat capacitor tester and they started to leak
at 25volts (pretty bad for a 200v cap!). I put in some 630v Orange drops and I can report similar
improved results as Dave. Note: the resistors also drift, so it is a good idea to replace them
also, the IF at this point is in the order of 50kHz so any quality resitor will do the job here.

I have done this work on two SX-100's and one SX-101A, it is a pain removing the wafer switch to
do the work, but worth the result.

Rodney
VK2KTZ


--- Dave Moorman <dmoorman4 at attbi.com> wrote:
> I've been working at recapping an SX-101A I bought a couple of weeks ago and
> replaced the caps on the selectivity switch this morning.
> 
> The results have been excellent.  The selectivity system worked fairly well
> before, and it works even better now.  With the 500 Hz bandwidth in
> conjunction with the notch filter, almost any signal is readable.  Sweet!
> 
> Dave
> 
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