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

An externally hosted image should be here but it was not working when we last tested it.

 

[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

 

[MRupp]

I assume that the performance of the more often used Neumann SX-66 and SX-74 cutter heads is a bit worse.

Maybe not when it comes to bandwidth, if the following info is correct: "... Now, here is the blow-mind part: The unit (SX-74) cuts flat from 2 hz to 27,000 cycles!" Found in: http://www.stevehoffman.tv/forums/archive/index.php/t-22099.html

 

[alexo]

Paolo,

Drop me an email and I'll explain whatever you might EVER need to know to cut your LPs...
...and you seem to worry too much about channel sep. It's not that important.

 

[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

Oh, only now have understood the point!

The process from master to final LP copies are performed obiouvsly by "pressing"....😀
No reduction/degradation thus!🙂

Cheers,
Paolo