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Answers:  Hello Syddo,

The difference is in the chief TYPE OF TRANSISTORS used in the amplifiers. There are abundant basic transistor ¡°types¡±, and clear in your mind ones are best suited for various kind of amplifier circuits. I have included some links to a pattern tutorial on the various types of transistors.

BJT stands for Bipolar Junction Transistor. Click this knit to learn nearly them:
http://www.uoguelph.ca/~antoon/tutorial/...

JFET stands for Junction Field Effect Transistor. This link explains this type.
http://www.uoguelph.ca/~antoon/tutorial/...

Insofar as you did not specify what loving of amplifier you are concerned with (e. g. audio, RF, video, etc.) it is unattainable to further differentiate between the two, regarding the more complex parameter.

Also, here is an additional mention, explaining various transistor ¡°types¡±:
http://en.wikipedia.org/wiki/Transistor#...

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