This post explains for the Transistor.
The Part Number is KD617.
The function of this semiconductor is AF Power Transistor.
The package is TO-3P Type.
Manufacturer: Tesla Elektronicke
KD617 is 70W, 80V, 10A, AF Power Transistor. An AF (Audio Frequency) Power Transistor is a type of transistor specifically designed for amplifying audio signals in electronic circuits. Audio signals typically fall within the range of frequencies that humans can hear, which is roughly 20 Hz to 20,000 Hz. AF power transistors are optimized for applications where power amplification of audio signals is required. They are commonly used in audio amplifiers, including those found in stereo systems, radios, and other audio equipment.
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 80 V
2. Emitter to Base Voltage: Vebo = 5 V
3. Collector Current: Ic = 10 A
4. Collector Dissipation : Ptot = 70 W
KD617 PDF Datasheet
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