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  1. #1

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    Default Class A, Class B amps, etc.?

    When people talk about Class A, Class B, Class D amps/preamps etc, etc, what are they talking about? Is this a specific designation or a general (subjective) category (like B movies, for instance)?

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    Here is a link Norm that should explain everything and then some.

    Amplifiers
    Michael ;)
    In the beginning, all knowledge was new!

    NORTH of 60

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    Quote Originally Posted by janmike View Post
    Here is a link Norm that should explain everything and then some.

    Amplifiers
    Wow, There's a lot info there!
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    Oooo... full reproduction of the sine way... Oooo

    Any question beyond that link Norm?

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    Thanks for the link, Michael. Yes, there is a ton of information there. I've read through it, though there are a quite a few technical terms sprinkled within with which I am not familiar. I'll keep it bookmarked for reference and "slow digestion."

    I am wondering, for you guys and gals who are serious about amps, whether is there is a pecking order of these classes in your mind when you go looking to purchase an amp? Are there certain characteristics that you tend to associate with one or more of these classes?

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    Quote Originally Posted by Norm Apter View Post
    I am wondering, for you guys and gals who are serious about amps, whether is there is a pecking order of these classes in your mind when you go looking to purchase an amp? Are there certain characteristics that you tend to associate with one or more of these classes?
    IMO there isn't really a pecking order in amp classes, yet I am sure many will try to refute that point. My opinion comes from experience with many amps, including class D, A/AB, A, T, G. Some sound better then others, but is hard to tell if it is the amp or the class. That said I always say to pick your speakers first then pick a amp to match.

    As for characteristics, from my experience:

    Class A, runs warm/hot, very liquid mids w/ good bass, non fatiguing
    Class D, great bass, runs cold, good mids, detailed highs
    Class T, sounds like class A but less dynamic and runs cool like class D.
    Last edited by Gaara; 05-25-2008 at 03:09 PM.

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    all the best,
    mrh

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    Class A is the favorite of some, but I don't know if that is because of the sound or the reputation. I like my A tube amp, but it does get really warm also running 10 tubes.

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    I agree that it is mostly about personal preference. For many a good pure Class A SET tube amp is to die for. Mind you Class D's are definately the up and coming and some of the better manufacturers are puttting out some nice sounding products in Class D.

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    I like the A/B amps with a fat toroidal PS, and large caps. They last for a real long time, and don't have an over abundance of parts like some of the other types out there. Class A would be nice, but they are very inefficient, and as stated above create lots of heat.
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    Quote Originally Posted by ben62670 View Post
    I like the A/B amps with a fat toroidal PS, and large caps. They last for a real long time, and don't have an over abundance of parts like some of the other types out there. Class A would be nice, but they are very inefficient, and as stated above create lots of heat.
    Agreed, biasing is key. AB performs very well overall.

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