Help With Potentiometer

machone
machone Posts: 1,510
in 2 Channel Audio
I have had a slight center image shift to the left for some time. My listening room has been a such a mess that until now that I did not concern myself with it.

With music and SDA's I was not 100% sure that it is shifted so I found an old Maxell test cd with test tones to confirm. I also used my grandson to confirm that it is not my ears.

So I am on a quest to find the root cause. I have not finished the search but after talking to Musical Concepts (they rebuilt my Haflers) one cause could be the volume pot.

Currently it is a Bournes 50k pot.

My question is if turns out to be the volume pot what would you recommend as a replacement.
Mojo Audio Illuminati v3>>Quantum Byte w/LMS>>Rpi/PiCoreplayer>> Starlight 7 USB >> Mojo Audio Mystique v2 SE>>ModWright SWL 9.0 SE Signature>>Hafler DH-500 Amp+ (Musical Concepts Fully Modded)>>
SRS 2.3TL (Fully Modded)...Velodyne Optimum 8 subwoofer
1KVA Dreadnought

Marantz SA 8005
Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
Yamaha TX-540 Tuner...Sony BDP-S570
Sony PS4

Separate subpanel with four dedicated 20 amp circuits.
1. Amplification 2. Analog 3. Digital 4. Video

"All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
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Comments

  • F1nut
    F1nut Posts: 50,552
    Very high quality pots are bloody expensive, so take a look at what's available and fits your budget.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • txcoastal1
    txcoastal1 Posts: 13,285
    I also notice there is a balance POT on the Hafler DH-110 Preamp
    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
    Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC

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  • machone
    machone Posts: 1,510
    Yeah,

    I plugged the SA8005 directly into the amp and ran the test disc. Everything seemed centered. Crossed the IC'S and double checked. All good.

    Put the preamp back in the loop and now everything seems centered!

    Must have been an oxidized cable connections?
    Mojo Audio Illuminati v3>>Quantum Byte w/LMS>>Rpi/PiCoreplayer>> Starlight 7 USB >> Mojo Audio Mystique v2 SE>>ModWright SWL 9.0 SE Signature>>Hafler DH-500 Amp+ (Musical Concepts Fully Modded)>>
    SRS 2.3TL (Fully Modded)...Velodyne Optimum 8 subwoofer
    1KVA Dreadnought

    Marantz SA 8005
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570
    Sony PS4

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
    · Share on FacebookShare on Twitter
  • jdjohn
    jdjohn Posts: 3,150
    As preventative maintenance for the future, you might consider spraying DeOxit on those connections AND inside that volume pot...unless it's totally sealed. Might as well hit the inside of the balance pot, tone controls, and rotary switches while in there, along with anything else that has contacts.
    "This may not matter to you, but it does to me for various reasons, many of them illogical or irrational, but the vinyl hobby is not really logical or rational..." - member on Vinyl Engine
    "Sometimes I do what I want to do. The rest of the time, I do what I have to." - Cicero, in Gladiator
    Regarding collectibles: "It's not who gets it. It's who gets stuck with it." - Jimmy Fallon
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  • machone
    machone Posts: 1,510
    jdjohn wrote: »
    As preventative maintenance for the future, you might consider spraying DeOxit on those connections AND inside that volume pot...unless it's totally sealed. Might as well hit the inside of the balance pot, tone controls, and rotary switches while in there, along with anything else that has contacts.

    I plan to open it this weekend and do just that.
    Also there are some ribbon connectors that need to be addressed.
    Last night the image was shifted again!
    Mojo Audio Illuminati v3>>Quantum Byte w/LMS>>Rpi/PiCoreplayer>> Starlight 7 USB >> Mojo Audio Mystique v2 SE>>ModWright SWL 9.0 SE Signature>>Hafler DH-500 Amp+ (Musical Concepts Fully Modded)>>
    SRS 2.3TL (Fully Modded)...Velodyne Optimum 8 subwoofer
    1KVA Dreadnought

    Marantz SA 8005
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570
    Sony PS4

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
    · Share on FacebookShare on Twitter