Pro-Ject Tube Box DS

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Tube Box DS is a high-end MM/MC phono preamplifier featuring an unprecedented level of flexibility at its price point. It is based on a dual-mono circuit topology featuring a matched pair of premium ECC-803 Golden Pin Tubes. Premium parts are employed throughout the preamplifier circuitry including costly ultra-low noise semiconductors. Unique to this model is continuously variable control of cartridge input impedance loading. By being able to adjust anywhere within the range of from 10-1,000 ohms, you can dial in the perfectly appropriate impedance for your particular phono cartridge therefore achieving the cartridge's optimized performance. Gain adjustment is also selectable in three steps of 40/50/60 dB, covering a wide range of both Moving Magnet of Moving Coil cartridge brands. For Moving Magnet cartridges input capacitance is also variable. A switchable subsonic filter is also provided that can filter out frequencies below 20Hz.


  • Tubes: 2 x ECC-803 Golden Pin Triode Type
  • Load Impedance: Variable from 10 - 1,000 ohms
  • Input Capacitance: Variable 47pF, 147pF, 267pF and 367pF / 47k ohms
  • Input Gain: 40dB / 50dB / 60dB
  • Noise Floor: -82dB
  • THD: 0.1%
  • RIAA Curve Accuracy: 20Hz-20kHz / max 0.5dB
  • Subsonic Filter: 20Hz at 18dB/octave, Switchable
  • Input: 1pr RCA Jacks
  • Line Level Outputs: 1pr RCA Jacks
  • Power Supply Output Voltage: 18 VAC / 1,000mV
  • Power Consumption: 490mA DC
  • Dimensions (W x H x D): 4.1 x 2.9 x 5.7 in., 103 x 72 x 144 mm
  • Weight: 2.4 lbs., 1,100g
  • Finish: Black or Silver

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