[Hallicrafters] SX-110 crystal filter

[Fred Olsen]

 >>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.

John Brooks wrote:
> I'll be asking around for a copy of that modification.

Ditto.  If anyone has that in transmittable form I'd be pleased to get it.

Thanks,
Fred
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