need info about LP lathe etcher

[inertial]

Hi,

Please do you know a website where I can see some graphs about
LP " lathe etcher" ?
I am interested in performance about frequency response and channel separation Vs frequency.
Perdone my poor english , I'm searching to learn about LP production
phases/ process.

Thanks for the help

Cheers,
Paolo

[inertial]

Excuse me,
I 'm referring obyouvsly to the stylus etcher of the lathe machine.

Cheers,
Paolo

[jeff spall]

Hi, I think the answer depends on the lathe - like asking "what is the response of a cartridge"

You should be able to get some expert advice here:

http://lathetrolls.phpbbweb.com/

It's a forum dedicated to record cutting.

[inertial]

Yes Jeff, you are right!

Perdone me, I was curious to see if a "very-good" stylus heatcher has the same issues as like a "good" MC cartridge .........to say a channel separation of about 30dB or even worse!

Very thanks for the link, probabily it is the best place to ask for !

Cheers,
Paolo

[Werner]

Look here:

http://www.etec.dk/disc-cutting.html

[inertial]

Fantastic Werner!!
It is exatcly what I need.
Just one question befor read all the link : Is this the stylus for the production of the "master LP"first piece, am I right?
Then , from this master, they derivate all the copies for sell, no?
Perdone my basics question , I am newbie on analogue!

Thanks very much,
Paolo

[Werner]

Yes.

But this is for a 'modern' Ortofon head developed for
4-channel recordings. These were/are not often
used for commercial LPs. I assume that the performance
of the more often used Neumann SX-66 and SX-74 cutter
heads is a bit worse.

[inertial]

Thanks! you are very kind

I have a strange question: Suppose we make the first Master piece
with that Ortofon machine, we have about 30dB of separation ( approx, just for understand).
When we take the master and derivate all the copies can we assume
approx we are loosing others 6 dB thus in total our final product is
30-6 = 24dB approximatively?

Cheers,
Paolo

[Werner]

I don't think the further process of making mothers, stampers, and finally records does much harm to channel separation.

I have often measured separation in excess of 30dB using
commercial test records, so this is definitely possible.

On the other hand, expect treble response to suffer severely from the production.

[inertial]

Excuse me,I don't understand.
If I make a second "read" from master to write the copies,
I am making the process two times so you have 30db separation on the "residual" presents in the master, or not ?
Am I totally wrong in my reasoning?

Cheers,
Paolo