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