Tube Box E finally enriches the E-line with highly popular tube phono preamplifiers featuring a fully discrete circuit design without using any operational amplifiers (OpAmps).

This results not only in fantastic low noise phono amplification with clean measurements and accurate RIAA equalisation, but also ensures a long product life-cycle as maintenance, service and repair are ensured for years and years to come. It also comes with replaceable tubes for tube rolling and sound-shaping giving you many options to pick from and alter the sound signature to your preference.

ProJect Audio Systems Tube Box E will give a full and relaxed laid back sound with lush mids, just like you would expect from a much bigger high-end tube phono preamplifier.

Precise Loading for MM & MC

It offers support for both MM and MC cartridges and comes with many gain settings to be switched on the front panel. Wide ranging loading options can be adjusted on the bottom of the unit allowing you to precision match your Tube Box E to your cartridge!

The enclosure is fully made out of metal to protect it effectively against electromagnetic interference and vibrations, which can cause unpleasant listening experiences. The front panel and control elements are made out of beautifully machined aluminium.

Product Features

• Suitable for MM and MC cartridges
• Precise RIAA equalisation in two parts, passive/active
• 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 in silver or black

Technical Specifications

Tubes
2 x ECC83 (12AX 7A)

Input impedance
10 ohms, 100 ohms, 1 kohm, 2 kohms

Input capacitance/impedance
47pF, 147pF, 267pF, 367 pF, 487 pF and 587 pF* / 47 kohms

Input gain
40 dB, 43 dB / 50 dB, 60 dB und 63 dB

Noise floor
77 dB (A weighted) at 40 dB input gain
65dB (A weighted) at 50 dB
63 dB input gain

THD
<0.03% at 40 dB input gain <0.07% at 50 dB
63 dB input gain

RIAA-equalisation curve accuracy
+/- 0.5 dB/20 Hz - 20 kHz

Subsonic filter
at 20 Hz with 18 dB/octave

Input
1 pair RCA/phono sockets

Line-level output
1 pair RCA/phono sockets

Outboard power supply
18 V / 1.000 mA DC, suitable for your country's mains supply

Power consumption
470 mA DC, <1W in standby

Dimensions (W x H x D) with sockets
103 x 73 x 131 mm

Weight
450 g without power supply