This article mainly uses sharp-cutoff beam-emitting tetrodes 6J3 and 6N3 to form a current source load common cathode amplifier circuit, which has a certain voltage and current, and the input and output impedance are similar to the general common cathode circuit. But it is also a current source load SRPP circuit, which is simple, has good amplification, wide frequency response, large dynamic range, bright and soft sound quality, distortion coefficient, and strong sound field expression. Use with 100~300 ohm headphones. This headphone amplifier circuit can also be used as a preamplifier, and its performance is equally outstanding. The circuit schematic is as follows:
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