Ripping an LP. What is wrong here and how do I fix it?

kill_surf_city · 122

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Offline kill_surf_city

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on: November 10, 2024, 04:49:11 PM
Here's the waveform. Seems to be out of balance in some way, but I'm not sure. Is this a channel imbalance or what? Also, when I'm monitoring, it seems like I'm getting a bit more noise/distortion/clicks in the right ear.
« Last Edit: November 10, 2024, 05:05:25 PM by kill_surf_city »



Offline kill_surf_city

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Reply #1 on: November 11, 2024, 10:43:15 AM
After doing some reading online, i'm seeing that it might be DC offset. Is there a specific place in the Eros I could test to see if the voltage is off.



Offline Paul Birkeland

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Reply #2 on: November 11, 2024, 11:13:43 AM
The DC offset is eliminated by the coupling cap at each output jack and the resistor across the jack itself. 

There are some directly coupled solid state electronics that will go into a tizzy with a few thousandths of a volt of DC offset appearing at the input jacks, so you may need to determine if your capture device is cap couple or if perhaps there's just a funky ground in the Eros that isn't pulling that offset down.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline kill_surf_city

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Reply #3 on: November 11, 2024, 11:34:13 AM
The DC offset is eliminated by the coupling cap at each output jack and the resistor across the jack itself. 

There are some directly coupled solid state electronics that will go into a tizzy with a few thousandths of a volt of DC offset appearing at the input jacks, so you may need to determine if your capture device is cap couple or if perhaps there's just a funky ground in the Eros that isn't pulling that offset down.



Okay cool. I’m using a Scarlett 2i2  to capture audio. How do I determine if it is cap couple? Also, I have a ground wire running from my tone arm that I attach to the Eros. I had the wiring upgraded in my tonearm and part of the upgrade was adding a ground. I have it attached to the ground point on the Eros between the two input RCAs. I wonder if removing it would make a difference.
« Last Edit: November 11, 2024, 11:37:45 AM by kill_surf_city »



Offline Paul Birkeland

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Reply #4 on: November 11, 2024, 02:46:26 PM
Removing the tonearm ground is only likely to introduce hum. 

You would have to ask the manufacturer of your interface if the input is cap coupled.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man