Alternative way to analyse LP cartridge behaviour
 

In recent weeks my interest have gone via a sort of 'almost random walk'.
This started with MQA and the obsession that has with 'timing' via
wondering about the time domain behaviour of microphones and old tape
recorders to the behaviour of LP replay cartridges and styli.

This made me wonder about analysing the stylus mechanical system in terms
of a mismatched transmission line. So I've had a go out of curiosity and
the initial results, etc, are now available from

http://www.audiomisc.co.uk/HFN/LP5/StylusBehaviour.html

Want to find out a bit more about the materials side. Then maybe look at
the associated time-domain behaviour. But I thought some might find the
above interesting as is...

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics https://www.st-andrews.ac.uk/~www_pa...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Alternative way to analyse LP cartridge behaviour
 

Funnily enough back in the 1970s this topic was ina Shure blurb about their
v15 was it cart and what arm etc it should be in and how it affected the
transmission line resonances of the cantilever damping etc.
I always thought it was a bit of snake oil to blind people with science at
the time. Did anyone ever look at the way the surface of the record
deformed as part of this?
I remember that I had, for a while a Decca London which sounded quite nice
but wore records out fast as it had very poor complience. Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Jim Lesurf" wrote in message
...
In recent weeks my interest have gone via a sort of 'almost random walk'.
This started with MQA and the obsession that has with 'timing' via
wondering about the time domain behaviour of microphones and old tape
recorders to the behaviour of LP replay cartridges and styli.

This made me wonder about analysing the stylus mechanical system in terms
of a mismatched transmission line. So I've had a go out of curiosity and
the initial results, etc, are now available from

http://www.audiomisc.co.uk/HFN/LP5/StylusBehaviour.html

Want to find out a bit more about the materials side. Then maybe look at
the associated time-domain behaviour. But I thought some might find the
above interesting as is...

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics
https://www.st-andrews.ac.uk/~www_pa...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Alternative way to analyse LP cartridge behaviour
 

Yes, a number of people investigated aspects like vinyl deformation, etc.

The problem was that they tended to get different results and ended up
arguing over what was happening! If you have access to the literature look
for names like Walton, Barlow, White, Kogan, etc. It seems likely that the
vinyl also deformed in a dynamic way meaning the stylus was 'surfing a
wave' to some extent. Nonlinear dynamics.

There is also an interesting paper by Sank (RCA). Maybe I should reference
a list of these on the webpage, but the snag is that for many you may need
to be an AES member to access a copy.

One possible reason was that the actual vinyl varied. e.g. a current issue
of HFN mentions the differences between the vinyl stock used by Decca and
EMI and how Nimbus had their own, different, formulation.

Jim

In article , Brian Gaff
wrote:
Funnily enough back in the 1970s this topic was ina Shure blurb about
their v15 was it cart and what arm etc it should be in and how it
affected the transmission line resonances of the cantilever damping etc.
I always thought it was a bit of snake oil to blind people with science
at the time. Did anyone ever look at the way the surface of the record
deformed as part of this? I remember that I had, for a while a Decca
London which sounded quite nice but wore records out fast as it had
very poor complience. Brian

--
Please use the address on the audiomisc page if you wish to email me.
Electronics https://www.st-andrews.ac.uk/~www_pa...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html