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About red indicators on inside my Little Mark Tube 800

Discussion in 'Amps and Cabs [BG]' started by Vahagn, Jan 9, 2018.


  1. Vahagn

    Vahagn

    Jan 9, 2018
    I would like to know why two red indicators are burning inside Little Mark Tube 800 amp head after some time of use? Is this a warning, or it's a simple working process?
    Regards, Vahagn. IMG_20180109_235049.jpg
     
  2. abarson

    abarson

    Nov 6, 2003
    Santa Cruz
    What does Markbass say they are?
    Are they possibly the preamp tubes?
     
    Vahagn likes this.
  3. two fingers

    two fingers Opinionated blowhard. But not mad about it. Suspended Gold Supporting Member

    Feb 7, 2005
    Eastern NC USA


    Maybe this?
     
    Vahagn likes this.
  4. A better picture would certainly help.
     
  5. Vahagn

    Vahagn

    Jan 9, 2018
    I wrote to their email, but no answer yet.
     
    FenderB likes this.
  6. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    Are they on all the time, or only after a while?
     
  7. Vahagn

    Vahagn

    Jan 9, 2018
    I wrote to their email, but no answer yet. The preamp tube is situated in another place.
     
  8. Vahagn

    Vahagn

    Jan 9, 2018
    When I plug in the amplifier, they are on after a while, but when I turn it off an turn on immediately, they are already on all the time. When I wait for a while after turning off and turn on, they are not on and they are on after approximately 1 or 2 hours.
     
  9. Vahagn

    Vahagn

    Jan 9, 2018
    For better picture, I must open it)))
     
  10. Vahagn

    Vahagn

    Jan 9, 2018
    Yes, I think, they are the same red lights, but my amp is not cutting, it works perfectly.
     
  11. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    No idea then, sorry.
     
  12. Vahagn

    Vahagn

    Jan 9, 2018
    Thank you!
     
  13. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    It's not uncommon to see LEDs as "power good" indicators, or sometimes as biasing elements. But in that case I would typically expect them to come on and stay on shortly after power-up.
     
  14. FenderB

    FenderB Supporting Member

    Mar 28, 2016
    Findlay, Ohio
    Call them.
     
    Vahagn likes this.
  15. Vahagn

    Vahagn

    Jan 9, 2018
    It's a good idea, I think.
     
  16. Vahagn

    Vahagn

    Jan 9, 2018
    May be, thanks!
     
  17. telecopy

    telecopy

    Dec 6, 2009
    USA
    Error codes? Are there other LEDs by them that are dark? Could be error indications for troubleshooter.
     
  18. ThinCrappyTone

    ThinCrappyTone Mostly harmless Supporting Member

    Oct 1, 2011
    Massachusetts, USA
    i would pop the top and see if there is anything nearby to indicate what they are, like text.

    Or maybe it’s just the tube glowing and reflecting off something when it gets hot, and it will become apparent when you open it.

    Edit: but don’t touch anything and die
     
  19. Pilgrim

    Pilgrim Supporting Member

    Since the amp is functioning, I suggest just being patient and working on getting a response from the manufacturer. No reason to take apart anything that's working.
     
    Last edited: Jan 11, 2018
  20. Vahagn

    Vahagn

    Jan 9, 2018
    There is also a green led inside, which is on when it works, it's clear, but I don't understand the mean of that red lights which are on after a while.
     

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