Using 6J3 and 6N3 to design earphone amplifier and preamplifier realization method

This article mainly uses sharp-cut beam-emitting diodes 6J3 and 6N3 to form a current source load common cathode amplifier circuit, which has a certain voltage and current. The input and output impedances are similar to common common cathode circuits. But it is also a SRPP circuit with current source load, which is simple, good amplification, wide frequency response, large dynamic range, bright and soft sound quality, distortion coefficient, strong sound field performance and so on. Used with 100 ~ 300 Euro headphones. This headphone amplifier circuit can also be used as a pre-amplifier and performs equally well. The circuit schematic is as follows: