Mainly vacuum tubes.
triode ....is not the answer point contact is the answer
A transistor is a solid state electronic device that replaced vacuum tubes for most uses.
These components are semiconductors.
The answer to the question is TRANSISTER
capacitor,transistor,resistor,inductor
The C4137 transistor is commonly replaced by the 2N5551 or MPS-U06, both of which can handle similar voltage and current ratings. However, it's essential to verify the specific application requirements, such as gain and switching speeds, to ensure compatibility. Always consult the datasheets for the components to confirm their suitability for your circuit.
Transistor.
The transistor replaced the vacuum tube as the primary component in electronic devices, offering smaller size, lower power consumption, and higher reliability. This transition marked the beginning of the semiconductor era in electronics.
A transistor is a device used to switch power between electrical components. Transistors work to amplify existing signals as well as open and close circuits.
No, it needs several other components and a source of power.
A: A diode a capacitor even a transistor must be connected to the the power as a polarized components
No. The PNP and NPN transistors are exactly opposite each other in polarity. You cannot just replace one for the other without redesigning the circuit.