12AU7 (ECC82) Cathode Follower Tube Preamplifier Schematic
The 12AU7 (ECC82) tube is a dual triode commonly used in audio applications due to its favorable characteristics for amplification. In the described schematic, the preamplifier consists of two stages, each utilizing one section of the dual triode. The first stage functions as a voltage amplifier, while the second stage operates as a cathode follower, providing a low output impedance.
In the first stage, the input signal is coupled through a capacitor to the grid of the first triode. A resistor is connected from the plate to the power supply, establishing the anode voltage. The output of this stage is taken from the plate, which provides a higher voltage signal that is then fed into the second stage.
The second stage, configured as a cathode follower, has its output taken from the cathode of the second triode. This configuration offers a low output impedance, making it suitable for driving loads such as tone controls or power amplifiers. The cathode follower also provides a buffering effect, isolating the first stage from the load and maintaining signal integrity.
The overall gain of the preamplifier is approximately 8 times, which is suitable for boosting weak audio signals to a level that can be further processed by subsequent stages in an audio system. The design emphasizes low distortion and high linearity, making it an effective choice for high-fidelity audio applications. Proper power supply decoupling and careful selection of component values are essential to optimize performance and minimize noise.12AU7 (ECC82) Cathode Follower Tube Preamplifier Schematic. Two stage 12AU7 preamplifier with low impedance output stage. The overall gain is about 8 times 🔗 External reference
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