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whats a mosfet amp?

Discussion in 'AV Receivers & Amplifiers' started by rory29, Jun 14, 2002.

  1. rory29

    rory29
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    Can someone please explain the diff between mosfet
    and the type fitted in the denon 1sr thanks in advance
    Rory
     
  2. Cliff

    Cliff
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    Mosfet is a type of transistor.

    Output devices that drive the speakers can be:-
    Silicon transistors (pretty normal)
    Mosfets
    Valves (for the enthusiast!)

    It's swings and roundabouts but Mosfets have the advantage of being very linear, and do not suffer from thermal runaway. ie when things get hot silicon transistors draw more current and can burn out unless the circuit is designed properly.

    IMO a good amplifier can be designed with either device!
     
  3. Ekko Star

    Ekko Star
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    Metal Oxide Semiconductor Field Effect Transisitor

    I'm no expert on this but......

    Generally when you drive an amp hard and at loud volumes for a long period of time the transistors tend to get very hot.

    A MOSFET amp can dissipate heat more effectivley through these transistors and so can stand up to far more industrious use ie running it all day long at very loud levels. That's why usually you'll find MOSFET amps in more professional & highly demanding applications.

    Other than this I'm not aware of any other difference but as I say I'm not an expert.
     
  4. rory29

    rory29
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    Thanks for your reply guys,
    I belive the new pioneer amp is fitted with this type
    of valve and the denon is not maybe this is why reviewers
    of the pioneer amp have been very impressed with
    its power?
    does anyone know what type is fitted in the Rotel
    RMB amps
     
  5. garmtz

    garmtz
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    It's not really that important which type of output transistors are used. With all types you can make either good or bad sounding amplifiers. Some very high-end amps use bi-ploar transistors instead of MOSFETs, with very good results. Let your ears decide if an amp is any good or not.

    The Rotel amps generally use MOSFETs.
     

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