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Check the listing for details. BGDR Tester Transistor Tracer Characteristic Curve Tester for Triodes Pairing. Condition: New. Listed at 94.56 USD. BGDR Tester Transistor Tracer Transistor Characteristic Curve Tester for Triodes Pairing Power Amplifier Debugging. - 1 x BGDR Tester. The maximum collector current is less than or equal to 150mA. Suitable for electronics enthusiasts, triode paired amplifier debugging, and electronic education and teaching.