Re: Serious vinyl quality control problem?


"Don Pearce" <nospam@xxxxxxxxxx> wrote in message
news:4989d005.364280851@xxxxxxxxxxxxxxxxxxxx
On Wed, 4 Feb 2009 19:17:45 +0200, "Iain Churches"
<IainNG@xxxxxxxxxxx> wrote:


<Don Pearce> wrote in message news:4992beba.108434515@xxxxxxxxxxxx
I was interested in how heavily modulated vinyl could be, so I popped
an old record (Long Hot Summer Night, Jimi Hendrix, Track Records
1968) under the microscope for a look. And what did I find? Two
adjacent grooves clearly broken into each other:

http://81.174.169.10/odds/grooves.jpg

Was this a really common back then, or is this kind of thing a rarity?


Neither rare nor common.
It was normal practice to examine heavily modulated passages
under ther microscope after cutting both the test and the final
master. Many cutting engineers used to also test cut loud segments
with excessive lateral excursion several times as a practice run.

But it was impossible to check every single patch with the microscope.
The master was never played, but the initial test cut usually was. If
no problems were encountered with say an SME 3009 and Shure V15
then the master went to the factory.

Are there tracking problems with the Hendrix, Don?

Iain



No, not at all. I was just feeling a bit bored and curious. I thought
that even in '68 there was some automation that predicted amplitude
and widened the pitch a little.


Yes, there was. Most cutting room tape machines had a standard
head bridge with the erase and record heads removed. There was a
"pre-cue" head, about the same distance again upstream, which fed
a servo amp. In addition, manual pitch adjustment was available.

Iain


.

Relevant Pages

  • Re: adaptaters for Leica DM 500
    ... I bought a Leica DM 500 microscope with a  trinocular head (inlet ... What other adapters do I need to place a camera canon eos 400 D? ... The manual shows that the trino head ...
    (sci.techniques.microscopy)
  • Re: Buying guide for a decent microscope?
    ... objectives when available at a good price, then a monocular head, then when I ... lot of microscope parts on Ebay but I wonder if you end up paying much more when buying in parts? ...
    (sci.techniques.microscopy)
  • Re: How is this biolam microscope??
    ... >> Would you consider a Novex microscope ... >Matti, ... It was dirty inside the optics in the head ...
    (sci.techniques.microscopy)
  • Re: Rash on Face
    ... > rashes on his head. ... > is gone where the rashes are. ... check it out under his microscope - you'd know immediately. ... Rocky's a Dog. ...
    (rec.pets.dogs.health)
Loading