TL-Audio - Ebony A1

Discrete Class A and Tube Dual preamp / DI

Preliminary Information

New from TL Audio, The Ebony Series is a sleek looking range of discrete Class A processors designed to heighten your audio experience.

The range consists of 3 units, all of which use Discrete Class A circuitry and have an optional tube stage with variable drive putting you in control of how ‘creamy?or how ‘cool?your unit sounds.
Hand assembled in England to the highest standards, the Ebony uses stylish, quality chrome knobs together with a high gloss black finish to make the exterior look just as smooth as the circuits sound.
The Ebony Series have all the features you come to expect with TL Audio, including balanced I/O, multi input options, analogue VU metering and intuitive, precise controls.
All units are also compatible with the TL Audio DO-2 digital SPDIF interface for easy digital connectivity with high quality conversion.
A combination of supreme quality, unrivalled sound and stylish aesthetics - this range offers superior analogue processing to accompany a digital world.

Why Class-A?
Class A circuits are designed with a constant current flowing through all of the transistors, which is sufficient to drive the peak output required from each block of the circuit. This ensures that every transistor is kept at its optimum operating point, minimising nonlinearities due to changes in current and internal thermal effects, and eliminating the objectionable “cross-over” distortion typical of class AB circuits.
Due to the higher steady state (or “quiescent”) currents used, the power dissipation of class A circuits is substantially higher than can in general be handled by integrated circuits. It is also possible to design discrete transistor circuits to operate at higher voltage rails than are available for audio integrated circuits, adding the benefit of greater headroom and improved dynamic range. For these reasons, there are no integrated circuits in the audio paths of the Ebony Series.
The outstanding audio quality is reflected in the technical specification of the units, with particularly low noise and distortion, and wide frequency response.

  • Discrete Class A and Tube Dual preamp / DI
  • 2 quality discrete class A preamps
  • 2 DI inputs for high/low impedence instrument input
  • Phantom Power
  • 30dB Pad
  • 90Hz High Pass Filter
  • Phase Reverse
  • Switchable tube stage with rotary drive control on each channel
  • Output gain stage
  • Analogue style VU metering
  • +10 dB metering for use with DAW
  • Mic Input:
    Discrete Class A circuitry from input to output (unless Tube stage In).
    Gain Range: +16dB to +60dB (-14dB to +30dB with pad)
    Maximum Input level: +10dBu (without pad), +30dB (with pad)
    Frequency Response: 10Hz to 40KHz, +0, -0.5dB, @ 40dB gain
    Distortion (THD + Noise): 0.025%, 20Hz to 20KHz @ 40dB gain
    Noise (EIN): -127dBu unweighted, 22Hz to 22KHz, 150 ohm source termination.

  • Instrument Input:
    Tube input stage, plus discrete Class A circuitry to output.
    Gain Range: +8dB to +40dB (“High”), -10dB to +22dB (“Low”)
    Input Impedance: 1Mohm (“High”), 70Kohm (“Low”).
    High Pass Filter: -3dB @ 90Hz, second order.

  • Output Gain:
    Maximum Gain +15dB.

  • Output:
    Maximum Level: +22dBu (2Kohm load), +26dBu (10Kohm load)
    Noise at minimum gain: -90dBu (22Hz to 22KHz).

  • Tube Stage:
    Typical Distortion: 1% to 10%, depending on “Drive” level, predominately
    second harmonic.
    Noise: -80dBu (22Hz to 22KHz), output gain @ 0dB.

  • Metering:
    Tube “Drive” LED: Variable intensity over 10dB level range, typically corresponding 
    to 1% to 5% THD.
    Tube “Peak” LED: Dependant on level and drive, typically corresponding to 10% THD.
    Output “Peak” LED: +19dBu on output.
    VU Meter: Switchable to Channel 1 or 2, and Input or Ouput.
    Nominal calibration: 0VU = +4dBu.
    +10dB switch calibration: 0VU = +14dBu.

  • Power Requirements:
    Internally set to 230V 50Hz or 115V 60Hz operation
    Detachable IEC power cord
    Power consumption 34VA.

  • Dimensions:
    2U, rack mounting or free-standing.
    W x H x D = 483mm x 88mm x 200mm (19.0” x 7.9” x 3.5”), behind front panel.
    Shipping weight: 6Kg.
A1 user manual
TL_Audio_A1_Manual.pdf (2012/09/23)