Description

Tube Box S2 uses fully discrete circuitry – no operational amplifiers here (aka Op-Amps, used in simpler, more affordable designs but with some sacrifice to sound quality). The standard, user-replaceable tubes sound stellar out of the box, though the design opens the gates for sound-shaping via tube rolling should you want to take it a step further.

Tube Box S2’s sonic presentation is full & relaxed with a blossoming midrange more typical of much more expensive designs. The stage welcomes most MM & MC cartridges on the market with a wide range of gain, loading & capacitance settings. The S2 series’ 2-layer aluminum/steel enclosure shields the circuitry from vibration and electromagnetic interference for more music, less noise.

Additional information
Weight0.41 kg
Dimensions13.1 × 10.3 × 7.3 cm
Color

,

Features

  • Suitable for MM and MC cartridges
  • Precise RIAA equalization 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
  • External power adaptor and multiple internal power supplies
  • Well-filtrated high-voltage anode power supply
  • Sandwich aluminum/metal casing protects from vibrations and electromagnetic interference
  • Available in silver or black
  • Handmade in Europe

Specs

  • Tubes: 2 x ECC83 (12AX 7A)
  • Input impedance: 10ohms, 100ohms, 1kohm, 2kohms A,
  • Input capacitance/impedance: 47pF, 147pF, 267pF, 367pF,487pF and 587pF*/47kohms B
  • Input gain: 40dB,43dB B ; 50dB, 53dB and 60dB, 63dB A
  • Noise floor: 80dB (A weighted) at 40dB input gain 75dB (A weighted) at 50 dB and 63dB input gain
  • THD: <0,02% at 40dB input gain <0,05% at 50dB and 63dB input gain
  • RIAA-equalisation curve accuracy: 20Hz – 20kHz / max. 0,4dB
  • Subsonic filter: at 20Hz with 18dB/octave
  • Input: 1 pair RCA/phono sockets
  • Line-level output: 1 pair RCA/phono sockets
  • Outboard power supply: 18V/1.000mA DC, suitable for your country’s mains supply
  • Power consumption: 470mA DC, <1W in standby

A: typical for low output MC cartridges, B: typical for MM cartridges or high output MC
*Input capacitance is irrelevant for low output MC cartridges.

Reviews

“What I am getting through this is an immediate improvement in sound stage depth, width, scale and also pinpoint accuracy and lower noise floor.” – Randall Messman, Cheap Audio Man

“Sounds fantastic and was a step up (no pun intended) from the solid-state phono preamp built into my Denon receiver” – Caleb Attaway, Analog Planet

Upgrades & Add-Ons…