On Thu, 20 Nov 2008 07:07:45 -0500, "Arny Krueger"
wrote:

Don Pearce wrote in message
news:49252ae2.230285046@localhost
On Wed, 19 Nov 2008 18:11:02 -0500, "Arny Krueger"
wrote:

"Don Pearce" wrote in message
et
Arny Krueger wrote:
"Arny Krueger" wrote in message

"Don Pearce" wrote in message
et
Arny Krueger wrote:

http://delback.co.uk/turntable_tests/
For grins, you might try to extract some frequency
response information from them.

The Linn Sondek in that last link has the most
fearsome wow (about 0.3% RMS) - bad enough to be a
real fault, I think.

Correct that. The predominate jitter frequency seems to
be 0.55 Hz - off-center record.

A test record shouldn't be able to go off-centre. All of
mine are drilled small, and are a very tight fit on the
spindle.

Who says that the hole was necessarily drilled or
punched in the right place?

Where else do we get 0.55 Hz FM from?

Well, that's the wow.

Agreed.

The raison d'etre of a test record
is that it is in itself far better than what you are
testing.

Some people seem to be a little weak on that point. ;-)

If we can't trust the makers even to put the
hole in the middle we may as well all give up right now.

Well, that's the problem with the LP format. It's dependent on all these
little mechanical thingies that even the people who are making short runs of
$50 test records can't seem to get right. What hope would there be for the
$2.95 LPs that you bought at the K-Mart store in the day of?

Well, us older folks know the answer to that - not much hope for the LP. 99%
of all music lovers moved on past the LP for this and many other related
reasons.

However, if you think that music with built-in wow is somehow "more musical"
than music with no audible flutter and wow, then that would be a pretty
strange view on "High Fidelity". To be exact, it would be "Low Fidelity".



Well, it certainly can be done. Here's a 300Hz track off my HFN test
record. Looking at it in spectral view in Audition, there is no wow
that I can discern. The setup is a Systemdek IV, SME 3009ii and
Audio-Technica OC9.

http://81.174.169.10/odds/wowtest.wav

d