[Hallicrafters] SX-110 crystal filter

[John Brooks]

I'll put the QF-1 on my list to look for at the next
hamfest!  If I'm successful, I'll be asking around for
a copy of that modification.

Thanks,
John

> I had a QF-1 on my original S-85 and it worked
> great. 
> There was a modification in the ARRL Hints & Kinks
> books back during the late 1950s and early 1960s
> that
> changed the "broad" tuning range of the QF-1 into a
> variable bandpass filter.  I did that on my QF-1 and
> that really added to its usefulness.
> 



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