Unbalanced Left and Right channels

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ClassicRockDude
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Unbalanced Left and Right channels

Post by ClassicRockDude » 20 Oct 2018 00:39

I am ripping Styx Grand Illusion MFSL-1-106 using a Thorens TD 160 with a Signet Tk9e cart. I am using Audacity software. You can see below that the left channel is definitely lower output. The sound image through the speakers is shifted to the right indicating lower left channel output. I play the same album on another TT using the same amp and pre-amp and the channels are balanced. This all tells me the problem is in the Thorens somewhere. I cleaned all the wire connections and the plug in the shell head. The stylus is clean.

Any ideas what might be causing this before I start changing head shells, carts, wires, etc., which can get expensive? :(
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dahoo
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Re: Unbalanced Left and Right channels

Post by dahoo » 20 Oct 2018 07:54

did you check azimuth? i found it plays a big part in unbalanced channels.
also antiskate of course.
Use a mono record or test record to be sure.

bernard1
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Re: Unbalanced Left and Right channels

Post by bernard1 » 20 Oct 2018 13:36

If you have a multimeter, you can check the resistance for each channel, at the end of the RCA connectors. If you have the same values, it can be a mechanical issue, antiskating, azimuth... If you mesure different values, then you have to check each part of cabling, from RCA to cartridge pins.

ClassicRockDude
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Re: Unbalanced Left and Right channels

Post by ClassicRockDude » 20 Oct 2018 17:16

In the back of my mind I kind of knew I would have to walk through the system piece by piece. I guess I was hoping for some miracle. Oh well.

Thanks folks.

JoeE SP9
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Re: Unbalanced Left and Right channels

Post by JoeE SP9 » 24 Oct 2018 21:15

No one else has asked so I will. Are you sure your cartridge is correctly aligned?

ClassicRockDude
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Re: Unbalanced Left and Right channels

Post by ClassicRockDude » 24 Nov 2018 22:36

JoeE SP9 wrote:
24 Oct 2018 21:15
No one else has asked so I will. Are you sure your cartridge is correctly aligned?
I was also thinking cart alignment as a possibility. Before I had a chance to do a cart alignment, I dug into the tonearm more and found some very brittle wires. In fact, I broke several at the connector despite handling gently. So now I am going to rewire the tonearm plus a cart alignment. Hopefully everything works when I put it back together. Unfortunately I will not be able to tell if the alignment, bad wires, or something else was the issue since I am changing multiple things at the same time. :(

JoeE SP9
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Re: Unbalanced Left and Right channels

Post by JoeE SP9 » 27 Nov 2018 16:39

The brittle wire issue is the significant thing.

isidroco
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Re: Unbalanced Left and Right channels

Post by isidroco » 27 Jun 2019 16:52

Maybe it's a stupid question: Did you tried to feed your sound card with a mono signal from an independent sound generator? Just to make sure it's not card related.

It's quite common to have some channel difference, usually with cooledit (audition) I do Analyse, Statistics to find Average RMS Power (my last rip: -30.18 -31.54), and then amplify accordingly taking in account not to exceed Peak Amplitude (same example: -9.03 -10.73). So in that case max non clipped possible amplification is -21.15 -20.81
Doing Amplify: 8.18 9.54 will achive: -22db avg on both channels.

2dB difference or less is very common and not to worry about. More than 4 dB would be something to investigate.

Bandit127
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Re: Unbalanced Left and Right channels

Post by Bandit127 » 27 Jun 2019 20:03

Cartridge alignment. I had the same, 6 dB off. Realigned and got it down to 3 dB. Realigned a while later and finally got it sorted.

Distortion on the vocals on Deep Purple In Rock, In To The Fire kept taking me back to the alignment. The balance being sorted in Audacity was a bonus to getting that "torture track" sorted.

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