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Thread: PreAmp - anyone experienced one channel initially then other?

  1. #1
    Join Date: Dec 2011

    Location: Newcastle Upon Tyne

    Posts: 531
    I'm Graeme.

    Default PreAmp - anyone experienced one channel initially then other?

    Hi

    I was wondering if anyone had experienced the following?

    PreAmp all connected up to Power Amp >> Speakers as normal.
    Start play a source (any, doesn't matter)
    Turn Pre-Amp (passive) volume pot clockwise, ever so slightly
    Only right channel comes out, quiet..
    Turn slightly further clockwise, both channels now equal.

    Is this normal at all? I mean, it's something I can live with, it's just I wondered if this is normal from a PreAmp?

    Thanks all
    Graeme
    I can whistle with my fingers, especially if I have a whistle.

  2. #2
    Join Date: Mar 2008

    Location: Galashiels

    Posts: 13,503
    I'm inthescottishmafia.

    Default

    Is this coming up from zero volume?
    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

    Hunter S Thompson

  3. #3
    Join Date: May 2016

    Location: Much Wenlock

    Posts: 1,454
    I'm Gary.

    Default

    Quote Originally Posted by Gmanuk101 View Post
    Hi

    I was wondering if anyone had experienced the following?

    PreAmp all connected up to Power Amp >> Speakers as normal.
    Start play a source (any, doesn't matter)
    Turn Pre-Amp (passive) volume pot clockwise, ever so slightly
    Only right channel comes out, quiet..
    Turn slightly further clockwise, both channels now equal.

    Is this normal at all? I mean, it's something I can live with, it's just I wondered if this is normal from a PreAmp?

    Thanks all
    Graeme
    I wouldn't think its anything like normal, presume you have checked all connections to pre amp and amp to ensure they're all tightly connected.

    Could just be dirty tracks on pre amp pot. Turn the power amps off, then rotate the volume control swiftly clockwise and anti-clockwise half a dozen times, if it's dirty tracks may clear. May need to open up and spray with contact cleaner.

    All this assumes that it's not a stepped attenuator.

    If this doesn't work the pot may be knackered.

    Gary
    It is easier to seek forgiveness than to ask permission

    Rules are meant for the obedience of fools and the guidance of wise men

  4. #4
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,757
    I'm Chris.

    Default

    Quote Originally Posted by Gmanuk101 View Post
    Hi

    I was wondering if anyone had experienced the following?

    PreAmp all connected up to Power Amp >> Speakers as normal.
    Start play a source (any, doesn't matter)
    Turn Pre-Amp (passive) volume pot clockwise, ever so slightly
    Only right channel comes out, quiet..
    Turn slightly further clockwise, both channels now equal.

    Is this normal at all? I mean, it's something I can live with, it's just I wondered if this is normal from a PreAmp?

    Thanks all
    Graeme
    It is a slightly worn track on the potentiometer or volume control, causing a differing of resistance for each channel ,at that
    part of the volume control's movement.

    Audio signals preferably, should be contact-less with attenuation, as well as contact-less with switching of inputs.

  5. #5
    Join Date: Dec 2011

    Location: Newcastle Upon Tyne

    Posts: 531
    I'm Graeme.

    Default

    Thanks all... I'll ask the original manufacturer to have a look at it.
    I can whistle with my fingers, especially if I have a whistle.

  6. #6
    Join Date: Dec 2011

    Location: Newcastle Upon Tyne

    Posts: 531
    I'm Graeme.

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    Quote Originally Posted by Ali Tait View Post
    Is this coming up from zero volume?
    It is Ali, yes
    Set at Zero
    Turn clockwise tiny amount, result = right channel only
    Turn clockwise another tiny amount, result = both channels
    I can whistle with my fingers, especially if I have a whistle.

  7. #7
    Join Date: Dec 2011

    Location: Newcastle Upon Tyne

    Posts: 531
    I'm Graeme.

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    Quote Originally Posted by Stryder5 View Post
    I wouldn't think its anything like normal, presume you have checked all connections to pre amp and amp to ensure they're all tightly connected.

    Could just be dirty tracks on pre amp pot. Turn the power amps off, then rotate the volume control swiftly clockwise and anti-clockwise half a dozen times, if it's dirty tracks may clear. May need to open up and spray with contact cleaner.

    All this assumes that it's not a stepped attenuator.

    If this doesn't work the pot may be knackered.

    Gary
    Hi Gary

    Yes all connections checked, double checked then a 'paranoid' check for safe measure
    Cables swapped, changed, including speaker cables.. even used different speakers...

    No, not stepped at all.

    Thanks for reply.
    G
    I can whistle with my fingers, especially if I have a whistle.

  8. #8
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,827
    I'm Alan.

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    Can be quite common with ordinary potentiometers, it is an imbalance of either the track to track (resistance) or wiper position when at very low settings.

  9. #9
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 84,993
    I'm Grant.

    Default

    yes could be, and probably is pot i'd think, although a low point on one channel might just need a little more juice to get it working. i have had something like that before many years ago... but pot first
    Regards,
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  10. #10
    Join Date: Dec 2017

    Location: Ontario, Canada

    Posts: 104
    I'm Dan.

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    That's just the characteristic of that particular pot. It's resistance with respect to the wiper is slightly off. You could replace the pot and have that change to the other channel, stay the same or balance both.
    It's not unusual to see.

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