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Tech question please

Discussion in 'Amps and Cabs [BG]' started by p12bassnut, Jun 28, 2020.

  1. Jun 28, 2020 #1
    p12bassnut

    p12bassnut Supporting Member

    Aug 27, 2009
    Texas
    Can you tell if this amp has a class AB or class D power section based on this picture ?
    Inquiry to manufacturer yields no results as of yet.
    Thanks
    IMG_1829.jpg
     
  2. Jun 28, 2020 #2
    nilebodgers

    nilebodgers

    Nov 25, 2017
    UK
    I’d guess AB judging by the emitter/source wirewounds and the lack of obvious output filter chokes. Markbass LM?
     
    fdeck likes this.
  3. Jun 28, 2020 #3
    p12bassnut

    p12bassnut Supporting Member

    Aug 27, 2009
    Texas
    Yes LMIII
    Just pulled the top to find out because I was told Markbass changed from AB to a class D in 2013 and this is an early 2013 model. Nothing wrong with the amp, works perfectly.
     
  4. Jun 28, 2020 #4
    beans-on-toast

    beans-on-toast

    Aug 7, 2008
    I see a transformer date code of 25/12, 25th week of 2012. Another is 20/12. There is a chance that your amp was manufactured in 2012.
     
  5. Jun 28, 2020 #5
    dbase

    dbase Gold Supporting Member

    Jan 3, 2008
    South Jersey, USA..
    I would say Class D since I don't see a big heavy transformer plus the fact it weighs only 6 lbs. I'll stop there since that's as far as my knowledge goes. ;)
     
  6. Jun 28, 2020 #6
    BassmanPaul

    BassmanPaul Inactive

    Aug 25, 2007
    Scarborough Ontario Canada
    It has a Switch Mode Power Supply - that's the stuff on the right of the chassis. One of those can supply a Class D output stage OR a Class AB. With my lack of Class D tinkering I would say the beast is Class AB.