Class H+ amplifier circuitry

Discussion in 'Archived Threads 2001-2004' started by Samuel Des, Apr 2, 2002.

  1. Samuel Des

    Samuel Des Supporting Actor

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    What is Class H+ amplifier circuitry? Saw this advertised with some Technics receivers at bestbuy.com
     
  2. JohnnyG

    JohnnyG Screenwriter

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    Basically, it's just what Panasonic calls their amplifier design.
     
  3. Jeff Hipps

    Jeff Hipps Stunt Coordinator

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    Class G, H, H+ are all similar amplifier design schemes in which the power supply has at least two available voltage rails (levels). One low voltage level is used most of the time which keeps heat dissipation down. When the program material calls for it, the amplifier switches to the high voltage rail to deliver higher output.

    Jeff Hipps
     
  4. Aslam Imran

    Aslam Imran Second Unit

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  5. Samuel Des

    Samuel Des Supporting Actor

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    Hey thanks for the info guys. [​IMG] very informative.
     
  6. Jeff Hipps

    Jeff Hipps Stunt Coordinator

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    There's nothing inherent in these designs that requires "rail crossover distortion." The Soundcraftsmen MA-5002 was one of the first amplifiers to use the dual rail design and it was well respected and fine sounding. However, I do agree, that be they called, Class G, H, H+ or Magnetic field, these amplifiers do require some extra engineering to avoid problems when they switch rails.

    Jeff
     
  7. Claude M

    Claude M Stunt Coordinator

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    Hey my MA-5002 turned 20 this year ( it's the older style with the square front handles, but with the LEDs not the analog meters) and still sounds great.
     
  8. Chris PC

    Chris PC Producer

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    So a "dual-rail" amplifier is not an A or B class or an AB class? AB would sound like the most similar, right?
     
  9. Jeff Hipps

    Jeff Hipps Stunt Coordinator

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    Classes A, AB and B basically refer to how the amplifier is biased and to how the amp handles the positive and negative half cycles of the signal.

    Classes G, H and H+ refer to the power supply voltage rails, so you're asking about apples and oranges.

    I am reasonably certain that most dual or multiple rail amplifier designs are also biased for Class AB operation.

    Jeff
     
  10. Chris PC

    Chris PC Producer

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    OK. That makes sense. I wanted to know how they relate.
     

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