The structure characteristics of electron tube power amplifier.Transistor amplifier works under low voltage and high current. The working voltage of power amplifier stage is within tens of volts, and the current is several or tens of amps. In the circuit design, the direct coupled (OCL, BTL, etc.) non output transformer circuit is mostly used, the output power can be very large, up to hundreds of watts, and the electrical performance is very high.
The electron tube amplifier works under the condition of high voltage and low current. The screen voltage of the terminal power amplifier can reach 400-500v or even kilovolt, while the current flowing through the electron tube is only tens to hundreds of Ma. Large input dynamic range and fast conversion speed.
Most of the tube amplifiers use discrete components, manual wiring and welding, with low efficiency and high cost. But the crystal amplifier mostly uses the transistor and the integrated circuit union way, widely uses the printed circuit board, the efficiency is high, the welding quality is stable, the electrical performance index is high.
