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On 14/04/2012, Richard L. Hess wrote:

> Hi, Don,
> 
> In the early 1970s, I recall getting into a long, and semi-heated
> discussion between two brands of cartridges. My colleague had done
> scope photos of various cartridges reproducing CBS Labs test records,
> including square waves. He said one cartridge was better than my
> favourite because it didn't show the ringing in the square waves. I
> said I didn't like his cartridge because it sounded dull and lifeless
> compared to my favourite which sounded more like live music.
> 
> I also recall, a half decade or more later, a magazine, I think it was
> AUDIO Magazine, showed scanning electron micrographs (SEM images) of
> the grooves of one or more CBS Labs test records and the ringing
> showed up in the SEM images!
> 
That is funny. Make sure you are testing for what you think you are
testing for.  ;-)

I would like to see those images.

> 
> On 2012-04-14 6:06 AM, Don Cox wrote:
>> Back in the days when The Gramophone carried technical reviews of
>> equipment, under John Borwick especially, oscilloscope traces of
>> pickup cartridges playing "square waves" were shown in all reviews. I
>> assume the actual waveforms on the LP were triangular.
> 
Regards
-- 
Don Cox
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