Pro-Ject Tube Box E Phono Stage
The Pro-Ject Tube Box E is a miniature-sized phono preamplifier that brings the much-loved valve sound to Pro-Ject’s E-line. It features a fully discrete circuit design that forgoes traditional operational amplifiers (OpAmps), resulting in exceptionally low-noise phono amplification, clean measurements, and precise RIAA equalisation. This design not only improves sound quality but also ensures long-term reliability, as the unit is built to be easily maintained and serviced. Additionally, the inclusion of replaceable tubes allows for tube rolling, enabling users to fine-tune the sonic character to their own preferences. The Tube Box E delivers a full, relaxed, and laid-back sound with rich midrange presence, reminiscent of larger and more expensive high-end valve phono preamps.
Features
- Suitable for MM and MC cartridges
- Precise passive & active RIAA equalisation
- Fully discreet circuit design without OpAmps
- 2x ECC83 tubes (replaceable)
- Front-sided Subsonic filter button
- Front-sided Gain control
- Ultra low noise circuitry with FET input stage
- Dual mono circuitry for optimized channel separation
- Polystyrene capacitors used where possible
- Gold-plated RCA in and outputs
- Multiple internal power supplies
- Well-filtrated high-voltage anode power supply
- Available with silver or black front panel
Precision Matching and Premium Build
Supporting both MM and MC cartridges, the Tube Box E includes multiple gain settings that can be conveniently adjusted from the front panel. Further loading options are available on the underside of the unit, allowing for precise cartridge matching and tailored performance. The robust metal enclosure provides excellent shielding against electromagnetic interference and vibrations, helping to maintain signal integrity and ensure an enjoyable listening experience. Completing the high-quality construction, the front panel and control elements are crafted from beautifully machined aluminium, adding a touch of elegance to its compact form.
Specifications
| Tube assembly: | 2x ECC83 (12AX7A) |
| Input impedance: | 10 / 100 / 1k / 2k ohms (A) |
| Capacitance: | 47 / 147 / 267 / 367 / 487 / 587 pF / 47k ohms (B0 |
| Gain: | 40, 43 (B) / 50, 53 / 60, 63 dB (A) |
| Noise floor: | 77 dB (A weighted) at 40 dB input gain65 dB (A weighted) at 50 dB and 63 dB input gain |
| THD: | <0.03% at 40 dB input gain<0.07% at 50 dB and 63 dB input gain |
| RIAA curve accuracy: | ±0.5 dB / 20 Hz – 20 kHz |
| Subsonic filter: | 20 Hz @ 18 dB/octave |
| Input / Output: | 1x RCA / 1x RCA |
| Outboard power supply: | 18V / 1A DC |
| Power consumption: | 470 mA DC, < 1W in standby |
| Dimensions W x H x D: | 103 x 73 x 115 (131) mm (with sockets) |
| Weight: | 450 g without power supply |
|
(A) Typical for low output MC cartridges (B) Typical for MM or high output MC cartridges |
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