The Secret Society of Lathe Trolls

harper · Joined: 25 Jun 2005 Posts: 30

Simon · Joined: 05 Mar 2008 Posts: 24

Great find

harper · Joined: 25 Jun 2005 Posts: 30

Figured this would be helpful for those who are trying to restore these suckers and new to everything. Download and print this out.

jacques artifex · Joined: 26 Feb 2008 Posts: 9 Location: Barcelona

Very good, Thanks.
_________________
In cut we trust

JayDC · Posted: Thu May 01, 2008 3:41 am Post subject:

Here are some test tone I made for all of yous..

It's a zip archive, inside are 4 test tones in wav format (16bit/44.1K).
These should help with calibration.

1. Sine wave sweeping up from 1Khz to 10Khz - 1 minute 40 seconds duration

2. Sine wave sweeping down from 1Khz to 50Hz - 1 minute 40 seconds duration

3. Pink Noise - 1 minute 40 seconds duration

4. White Noise - 1 minute 40 seconds duration

http://www.sendspace.com/pro/dl/wopnp3

studiorp · Joined: 01 Nov 2007 Posts: 29

I have written these files on a cd, many interesting, but which is the function of these frequences ?
What can I calibrate ?
Thanks.

JayDC · Posted: Thu May 01, 2008 11:37 am Post subject:

use these to set your EQ... Cut them to record, and play back through an osciloscope, or frequency analyzer. Compare with the ones on the cd, and make adjustments until they are very close to matching.

studiorp · Joined: 01 Nov 2007 Posts: 29

Ok, but these values correspond to an inverse curve riaa perhaps ?

JayDC · Posted: Thu May 01, 2008 12:51 pm Post subject:

no, send these through the riaa curve.

Playback the tones on acetate through a turntable hooked up to a turntable preamp. compare the tones (on disc with inverse riaa, then through riaa premap) to the originals (no riaa). They should be about the same. if not, adjust the EQ until they are the same..

These are the tones mentioned in the article above..

this process can take very many cuts..