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Old 20th December 2003, 01:50 PM   #1
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Default Amplifier Classes

I just got my new website up.

"The Audio Page" is a large page all about amplifiers. I put the different classes of amplifiers, but am not sure if they are riht. Are they? If not, what type of amp falls under each category?

http://www.electronet.5u.com -main site
http://www.electronet.5u.com/audio.htm -audio page

Thanks for the help, Mike
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Old 20th December 2003, 02:19 PM   #2
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Default Re: Amplifier Classes

Quote:
Originally posted by soundNERD
but am not sure if they are riht. Are they? If not, what type of amp falls under each category?

http://www.electronet.5u.com -main site
http://www.electronet.5u.com/audio.htm -audio page

Thanks for the help, Mike

Nope, not right.

There have been many sometimes discussions on this board dealing with the classification of amplifiers. The distinction between class A, AB and B has to do with the operating point of the gain devices, not the use or lack of output transformer. Tube amps can be class A and need output tranformers (eg. a SE 300B)

Also your commment about "Mosfets produce little heat" is only partially true. A mosfet amp running class A produces lots of heat. (Think Aleph or worse yet, Zen) Class AB amps are more efficient, but can be made with tubes, bipolars or mosfet output devices. There are other errors on the page, as well.

I'd suggest you do a bit more research before claiming to have the ultimate audio site
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Old 20th December 2003, 02:33 PM   #3
Stu is offline Stu  Australia
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Sorry to say this, but your understanding of amplifier classes is completely wrong - there are several sites that explain it, but it basically comes down to how frequently the devices are "on".

Class A - Always on, never cut off

Class B - On half the time, switches from one device to another at zero volts output

Class AB - Mostly similar to class B, but with some overlap of the output pairs "on" time, reducing crossover distortion

Class C - On less than half the time, as you said it isn't used for audio because of the very high distortion

Class D - Switches the output on and off rapidly - which "averages out" to the desired signal with some low-pass filtering

These are fairly informal and probably partially wrong definitions, but it should help you to understand the situation.

There are also a few other things I would revise if I were you - some other classifications are wrong (Gainclones are solid state amps, and MOSFETs are transistors - you speak of them as if they were seperate categories, and not sub-categories).

Also - I know of no solid state devices that can get as hot as a light bulb (several thousand degrees), do not confuse heat output and temperature - if there was no difference between the two, we wouldn't need heatsinks.
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Old 20th December 2003, 03:03 PM   #4
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I do applaud your desire to want to put together a simplified informational page about amplifier types, but it appears you've over-simplified to the point of being wrong in most of your statements. ( ex. the "D" in "Class D" does not stand for "digital" )


-Maz
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Old 20th December 2003, 04:05 PM   #5
joensd is offline joensd  Germany
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Quote:
Solid state amps use many transistors. They are basically like a large gainclone with the circuitry of it exposed.
Funny description of discrete "technology".
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Old 20th December 2003, 04:17 PM   #6
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And people wonder why you should not believe anything you read on the web.

So many errors, my suggestion would be to can the whole idea. We already have enough people who post similar nonsense here without another source.

Nothing personal.............so don't take it that way.

BTW, I ran across something that did a very good job of not only explaing the different classes, but had good block diagrams of the different types. Too bad I can't find it when I need it.

Jocko
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Old 20th December 2003, 05:08 PM   #7
sam9 is offline sam9  United States
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Yup. If there were a way to make an "Un-bookmark" in your browser, this site would be a candidate. If they are that far off base on the simple stuff, who knows what the rest of it might be like.
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Old 20th December 2003, 05:21 PM   #8
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Quote:
Originally posted by Jocko Homo
And people wonder why you should not believe anything you read on the web.

So many errors, my suggestion would be to can the whole idea. We already have enough people who post similar nonsense here without another source.

Nothing personal.............so don't take it that way.

BTW, I ran across something that did a very good job of not only explaing the different classes, but had good block diagrams of the different types. Too bad I can't find it when I need it.

Jocko
Hi Jocko,
Is it my imagination that I believe your owl is looking more angry day by day.

Keep up the good work
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Old 20th December 2003, 05:42 PM   #9
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Hi,

Quote:
Too bad I can't find it when I need it.
Jocko, I think I know which one you mean...

In the mean time:

www.bonavolta.ch/hobby/en/audio/t_bas13.htm

www.duncanamps.com/technical/ampclasses.html

http://www.astrosurf.com/lombry/qsl-...principle3.htm


http://www.tpub.com/content/neets/14...s/14180_18.htm

Cheers,
__________________
Frank
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Old 20th December 2003, 07:53 PM   #10
sreten is offline sreten  United Kingdom
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sorry SN,

I have to concur with other comments here, you are way out
of your depth, suggest you you give it up before you sink.

Nearly everything you say on your site is not correct.

Unfortunately having a basic knowledge of electronics does
not qualify you to write a basic introduction to electronics.
Introductions to subjects are incredibly difficult to write,
they have to be simple but more importantly not wrong.

You need to learn a lot more before you will be able to do this.

sreten.

If you carry on I can't wait for the "Tips and Tricks" section !
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