I can’t find the article/reference right now, but I recall reading about an 
experiment that NBC/RCA/Bell Labs ran in the 1930s while developing  Hi-FI.  An 
Orchestra sat behind a curtain.  Between the curtain and the orchestra was a 
physical acoustic filter that had the bandpass of a typical AM radio/speaker of 
the day.  The filter could be switched in or out.  The audience said the 
limited bandpass sounded more natural.  This was attributed to people being 
used to the sound of the radio but not a live orchestra.

Those of us who grew up with the Collins/National/Hammarlund tube gear probably 
had our standard of how receivers should sound established by those units.  The 
memory of the sights, smells, and sounds of our youth are with us forever.

David K0LUM

> On Jun 4, 2018, at 9:43 AM, Joseph Trombino, Jr <[email protected]> wrote:
> 
> Howdy Gang.
> 
> I recently sold my S-Line that had a 75S3C receiver in it and I’ve owned two 
> K3’s and now a KX3 and KX2.
> 
> I gotta admit that the tube audio was much more pleasant to listen to as 
> compared to the solid state rigs.
> 
> Can’t exactly say what the differences are but the tube audio sounded much 
> “fuller and rounder” that the solid state gear.
> 
> Don’t know if that poor description helps, but there it is.
> 
>                       73, Joe W2KJ

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