On Thu, 12 Mar 2015 12:14:10 +0000 (GMT), Jim Lesurf
wrote:

Just to let people know I've done some tidying and added a page to the
Audiomisc site.

http://www.audiomisc.co.uk/HFN/LPqua...denWonder.html

The new page looks at the changes in quality of LPs over the years.

All being well I plan to add another page or two soon on other topics.

Cheers,

Jim

A couple of things come to mind. At some point the vinyl got a lot
thinner - presumably a cost saving measure - and flatness suffered. A
particular kind of unflatness back then was the double "thumb and
finger grip" warp in the edge caused by manual removal from the press
while the plastic was still a bit too warm.

d