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Tube-Tech CL1B

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The Tube Tech CL1B is an all-tube optical mono compressor that delivers a musical and smooth compression sound, making it the industry standard for vocal tube compressors. The gain-reduction element, positioned after the input transformer, is controlled by the sidechain amplifier, which includes two time control circuits for fixed and variable Attack/Release. These circuits can be used separately or combined, providing unparalleled control and flexibility over the compression settings.

The CL1B stands out from other compressors thanks to its ability to preserve the clarity of the source, even at extreme settings. Whether you're recording vocals, guitar, bass, or keys, the CL1B delivers a smooth and musical compression that fits perfectly into any mix, without muddiness or distortion.

One of the standout features of the CL1B is its intuitive operation, making it easy to achieve your desired sound quickly and easily. Simply dial in the settings you need and hear the action immediately. The distinctive sound of the CL1B can be heard on countless legendary recordings, making it a must-have tool for any serious musician or producer.

With a low-distortion optical gain reduction element and an all-tube based push-pull amplifier, the CL1B boasts a frequency response of 5 Hz to 25 kHz and a low noise level of < -75 dBU @ 30 dB gain. The variable ratio ranges from 2:1 to 10:1, with continuously variable attack and release times. The output gain ranges from off to +30 dBU, while the variable threshold ranges from off to -40 dBU. The input impedance is 600Ω, and interconnection of several compressors is possible via two busses.

The VU meter shows input, compression, or output, and the clickless In/Out switch makes it easy to bypass the compressor without any audible clicks. The conductive plastic potentiometers and transformer-balanced and fully floating input and output ensure a high-quality and reliable performance every time.

Choose the Tube Tech CL1B for your next recording project and experience the industry standard for vocal tube compressors.

  • Unique, low-distortion optical gain reduction element
  • All-tube based push-pull amplifier
  • Frequency response @ -3 dB: 5 Hz to 25 kHz
  • Low noise: < -75 dBU @ 30 dB gain
  • CMRR: > 60 dB @ 10 kHz
  • Variable ratio from 2:1 to 10:1
  • Continuously variable attack and release times
  • Output gain: Off to +30 dBU
  • Variable threshold: Off to -40 dBU
  • Input impedance: 600Ω
  • Interconnection of several compressors via two busses
  • VU meter shows input, compression or output
  • Clickless In/Out switch
  • Conductive plastic potentiometers
  • Input and output are transformer balanced and fully floating


FAQ: Opto Compressors CL 1A and CL 1B difference

  • The circuit and functions are exactly the same. The amplifier section in the CL 1A is hardwired.
  • In the CL 1B the transformers and the tubes are placed inside the unit on a printed circuit board. The control circuit is on a PCB in both units.

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