darlington power amplifier transistors

[leo1500]

How do I test these darlington transistors whether good or not ????

Leo

 

[audioguru2]

Hi Leo,
My multimeter has a Diode Test function where it outputs a small current then shows the voltage. A darlington's forward-biased base-emitter would show about 1.2V. Reverse biased would show max volts. Forward-biased base to collector would show about 0.6V. Reverse-biased would show max volts. Forward or reverse-biased collector to emitter would show max volts. Max volts means no current flows.
The darlinton transistor tested this way must not be connected to a circuit.