Tube phono pre-amplifier
12AX7 x2 phono amplification stage, with passive RIAA equalization
Passive tone control circuit between 2 12AU7 stages, built with precision resistors and capacitors, 10 steps.
12AU7 cathode follower following the volume control
All stages are loaded with Depletion Mode Mosfets as constant current sources or sinks to achieve lowest noise, maximum gain, and minimum distortion.
6J52P / 7788 tube as voltage stabilizer
Tube mounting on rubber washers to isolate vibrations
DC heater supply
Aluminum chassis with tenons design, so that no screw were used