Made a gallbladder headphone amplifier, the main material is: 12AU7 (ECC82) tube / IRF510 MOSFET tube It is my first pair of headphone amplifier. Maybe I am not very professional, but I still think it is a very precision amplifier.
The input capacitor is the FNX-HS 1uF 100V from Japan's Black Diamond, which is the capacitor I found from the abandoned power supply. The other capacitors are Panasonic's FC series, and the resistors are the Vishay MRS25 series (copper feet, 1%, 0.6W).
Here are the actual parameters I measured with a multimeter:
V_supply = 12.6V benchtop linear power supply
I_supply=0.38A (degree displayed)
Left channel:
V_gate=10.90V
V_source=7.06V
V_cathode=0.063V
Right channel:
V_gate=11.01V
V_source=7.24V
V_cathode=0.059V
The center tap ground voltage is 6.30V.
The above parameters are very close to the test parameters of the circuit simulation:
I_supply=0.32A
V_g=11.05V
V_s=7.31V
V_c=0.059V
The circuit schematic is as follows:
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