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TL Audio 5051 Single Channel Vacuum Tube Microphone Preamp, Compressor, 4 Band EQ and Noise Gate

B&H # TL5051 MFR # 23-71021
TL Audio 5051 Single Channel Voice/Instrument Processor

TL Audio 5051 Single Channel Voice/Instrument Processor Back View

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The 5051 from TL Audio is a single channel voice and instrument processor with microphone, line and instrument inputs, a compressor, a four band equalizer and a noise gate. Housed in a 2U rack chassis, the single illuminated VU meter monitors the input level, output level or the compressor gain reduction.

Part of the Ivory 2 Series, the unit is a hybrid valve signal processor, which utilize low noise solid state electronics in conjunction with classic valve circuitry to produce an audio processing unit that offers a high quality signal path with a unique tube audio character.


Microphone and line inputs are provided on electronically balanced XLR connectors and the line input is duplicated on an unbalanced 1/4" TS phone connector.
A solid state, electronically balanced input amplifier is used to achieve very low noise, low distortion and wide bandwidth performance. An ECC83/12AX7A triode valve stage, run from a stabilized 150v DC supply, is used as a second stage voltage amplifier to obtain the classic vacuum tube sound and gradual overdrive characteristics.
Phantom power and a 30dB pad are provided on the microphone preamp stage along with a switchable 90Hz high pass filter.
A front panel instrument input is provided, thus allowing guitars, basses and keyboards to feed directly into the unit, removing the need for a separate DI box.


Balanced and unbalanced line outputs are provided on XLR and 1/4" TS phone connectors that can be used simultaneously.


A single illuminated VU meter monitors the input level, output level or the compressor gain reduction.


Offers variable control of threshold and ratio, with switchable attack and release times and a choice of soft or hard knee compression modes.
A "Hold" facility reduces LF distortion, and a side chain insert point is provided for frequency conscious compression.
An independent gain make-up control is provided, to retain the subjective loudness of a compressed signal, plus an overall master output level control.
The output control has a nominal 0dB of gain at its centre, with up to 15dB of further gain available to achieve the high level required for some digital recorders.


Four band valve EQ with a triode valve stage in each filter
Up to 12dB of cut or boost and a choice of four pre-selected frequencies on each band.
An "EQ PRE" switch places the EQ ahead of the compressor in the signal path.


Simple but effective noise gate with variable threshold to remove unwanted background noise.
Number of Channels Single
Inputs 1 x XLR Microphone
1 x XLR Line
1 x 1/4" TS phone Line
1 x 1/4" TS phone Instrument (front panel)
1 x 1/4" TRS phone Insert
Outputs 1 x XLR
Frequency Response 10Hz to 40KHz, +0, -1dB
Noise Mic EIN: -127dBu with 150 Ω source, 22Hz to 22kHz and maximum gain
Line: -80dBu, 22Hz to 22KHzt @ 0dBu
Gain Range +16dB to +60dB
Maximum Output +26dBu
Input Impedance Not specified by manufacturer
Phantom Power +48V at 10mA maximum
Threshold Range -20dBu to +20dBu
Ratio 1:1.5 to 1:30
Attack Time 0.5 mS to 40 mS (4-position switch)
Release Time 40 mS to 4 seconds (4-position switch)
Slope Hard / Soft Knee switch
Sidechain Yes
Filter Type High and Low Bands - Shelving
Mid-Hi and Mid-Lo - Peaking
Frequency Bands LF Band: 60Hz to 500Hz
LM Band: 250Hz to 2.2kHz
HM Band: 1.5kHz to 5kHz
HF Band: 2.2kHz to 12kHz
Bandwidth Q = 0.5
Range (Boost/Cut) +/-12dB
Light Indication
Threshold Range Not applicable
Ratio Not applicable
Attack Time Not applicable
Threshold Range Not applicable
Frequency Range Not applicable
Gate Threshold -60dBu to -10dBu
Gate Rate Fixed
Dimensions (WxDxH) 19" x 7 7/8" x 3 1/2"
Weight 13.25 lbs
Specialties Drive LED has progressive intensity to indicate valve drive
TL Audio 5051 Single Channel Vacuum Tube Microphone Preamp, Compressor, 4 Band EQ and Noise Gate
  • AC Power Cable
  • One (1) Year Warranty
  • Be the first to review this item


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