Hybrid Premium Amplifier

The front stage of this machine uses the famous domestic fever tube 6N11J as the motherboard. 6N11 is a
double three-pole electronic tube with medium P (produced blue 2 7) and low internal resistance (cap ≈ 2kfl). It is connected into a typical SRPP circuit. This circuit has It has outstanding advantages such as low output impedance, good fidelity, and dynamic range
, and is very suitable for making the line input stage of the amplifier . The working state is selected in Category A. At this time, the cathode current I0≈4mA, this
current generates a self-sufficient bias voltage of about 2V on the cathode resistor. The amplified sound source signal is output from the cathode of the upper half tube VEla
, and enters the base of the differential exciter VT1 through the C3 coupling station. The excitation signals are output by the collectors of VT1 and VT2 respectively, and
sent to the signal input terminals ① and @ pins of the power amplifier integrated circuit TDA15 21.