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Old 14th January 2021, 15:30   #6  |  Link
Emulgator
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Join Date: Feb 2007
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Greetings kap'n, from a sound engineer here.
Many thanks for your file.
Now we see a partially cleaned body, somebody wiped the traces before the coroner was called in;-)
An often heard sentence here at doom9: "Please post an unprocessed sample".
If you already applied cleaning, how shall anybody guess what the reason could be ?


But still what I can hear in the first seconds of the lead-in groove sounds familiar to me.
It matches the noise any laptop can generate.
Well, that does not exclude towers.

Here some DELL XPS M1710 are in use.
While performing repairs and checking schematics I can hear GPU and display lines send such noise.
It can be picked up by any magnetic sensing coil.
Guitar pickups, Rhodes pickups, Hammond pickups, unshielded audio transformers. Record Stylus pickups ? Why not.
Here In my setup I can literally hear that screeching change as columns or lines of screen content are updated.

How was your capture setup ? Which ADC did you choose ?
Which data connction to PC/Mac ? Find out about any possible ground loop.
Insert ground loop filter between RIAA amp, ADC, Mac/PC.
If capturing audio: Use glassfiber where you can. No ground loops.

As with neilwilkes' case the fault might not have been cut into the groove,
rather introduced by faulty capturing setup. There it was a blacklight lamp with a SMPS.
https://forum.doom9.org/showthread.php?t=182064
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Last edited by Emulgator; 14th January 2021 at 15:40.
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