This is a silicon transistor circuit showing typical voltage values. When the forward base/emitter voltage is 0.6 to 0.7 V, the transistor is silicon. Germanium transistors will have a forward base/emitter bias voltage of 0.2 to 0.3 V This is a silicon transistor because 2.6 base volts minus 1.9 emitter volts equal a forward bias of 0.7 volts indicating a silicon transistor.

At this point you should have more questions and want to learn more about how transistor circuits work, how to design your own transistor circuits and build electronic equipment.  Therefore; the next step would be to study the material in the following links.  From this study you will be on your way to learning more about transistor amplifier bias arrangements, the importance of impedance matching, transistor specifications, and transistor parameters.


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