[Table of Contents]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [ARSCLIST] 1937 shellac test pressing outperforms audio CD

On Friday, April 03, 2009 9:34 AM, Richard L. Hess wrote:

> A few years later, someone -- I think it was published in 
> audio -- had taken a scanning electron microscope to these 
> very same CBS test records and, low and behold, there was 
> RINGING recorded in the grooves! I wish I could find that 
> article again!

Richard, thanks.  Funny, but last night I met someone who 
has her own scanning electron microscope (SEM) in her 
*garage* (only here in Silicon Valley).  It is an older 
SEM - about 15 years old, hence the size.  If it turns out 
that my cartridge is not ringing, then I very well may put 
the disc under an SEM.

I have most of the CBS test records.  Do you recall which
test track you observed the ringing upon?  Square wave 
perhaps?  I may have to put that test record under the SEM
and see if I can reproduce the test results of that 

Eric Jacobs

The Audio Archive, Inc.
tel: 408.221.2128
fax: 408.549.9867
Disc and Tape Audio Transfer Services and Preservation Consulting

[Subject index] [Index for current month] [Table of Contents]