Finished KHD-4000 All Discrete Pure Class A Headphone Amplifier (KG Ver)
Input voltage: AC 110V or 220V (for choose)
Fully symmetrical from input to output
There is no even-order distortion
Symmetrical Power supply startup and shutdown, will not hear a “popping” sound .
Full discrete components
The circuit uses dual FET fully differential input stage is fully balanced, the operating current of each tube 2MA, the entire input stage current reaches 4MA, and maintained in a pure Class A operation, has the characteristics of high input impedance and low noise
Voltage amplifier stage is also a standard Class A amplification, operating current 14MA
Complementary push-pull output stage is followed by the design, and the use of high-current MJE15032,15033G tube! Can get a good impetus to the current adjusted each tube 80MA
With high PSRR (power supply rejection ratio)
DC servo circuit, ensure that no DC output protection headphones, headphone special protection package coupled with E12, so sit back and relax your headphones!
KHD-4000 headphone amplifier with high voltage (positive and negative 30V DC power supply), high current (per tube 80MA, and reach 160MA tube per channel), a gain of 11, is the ideal companion A / KG headphones