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One channel comes up first

Discussion in 'Tube Audio' started by CopperWizard, Aug 11, 2018.

  1. CopperWizard

    CopperWizard Well-Known Member

    Messages:
    855
    Location:
    Eugene, OR
    I have a Magnavox 8601-20 amp where after power is applied, the left channel comes up first from the speaker, then 2 seconds later the right channel. Everything sounds great. Just wondering if this is normal and why?
     

     

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  2. s-petersen

    s-petersen Scott Subscriber

    Messages:
    4,662
    Location:
    Middletown,New York
    Try swapping tubes, it could be normal as some tubes take a little longer.
     
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  3. primosounds

    primosounds Powered with pure tube sounds. Subscriber

    Messages:
    2,802
    Location:
    Terra, 21st century CE
    Yeah, i agree with SP, seems like a tube issue. Could be a noisy tube is making itself known ahead of the others.
     
  4. thorpej

    thorpej Super Member

    Messages:
    1,664
    Location:
    San Francisco, CA
    ...or one of the power tubes is weak and it's cathode doesn't start emitting until it's almost completely warmed up. If it's not one of the output tubes, it could be a weak side in the voltage amp tube as well.
     
  5. Dave451

    Dave451 AK Subscriber Subscriber

    Messages:
    1,179
    Location:
    Philly area
    Had the same thing happen with a couple of voltage/tone control 12AX7's. Both new production. One was a little 'colder blooded' than the other and came up to volume a couple seconds slower, but after that all was fine. Wouldn't worry about it if it were mine unless there are uneven levels side-to-side after warmup or any noise.
     
  6. CopperWizard

    CopperWizard Well-Known Member

    Messages:
    855
    Location:
    Eugene, OR
    Update: I switched the power tubes around and it followed the tube. They were both tested recently and were at 80%. They are Sylvania black plate 6bq5. I'm not going to worry about it as Dave suggested. Thanks for the replies fellow AKer's!
     

     

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  7. GordonW

    GordonW Speakerfixer Subscriber

    Messages:
    17,899
    Location:
    Marietta/Moultrie GA USA
    If it was more than 10 seconds differential, I'd be concerned about a weak or dying tube.

    2 seconds is completely within the realm of "absolutely normal".

    Regards,
    Gordon.
     
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