Tube-Tech CL 1B

Single-Channel Opto-Cell Compressor with Tube Amplifier
Tube-Tech CL 1B image 1
Tube-Tech CL 1B image 1
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Available This Thursday (June 1)
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Tube-Tech CL 1B
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Unbeatable Track Record!

The TUBE-TECH CL 1B Compressor, which was introduced in 1991 to replace the CL 1A, features a gain-reduction element, positioned immediately after the input transformer. It is controlled by the sidechain amplifier, which also contains the two time control circuits - one for fixed and one for variable Attack/Release. The two time-controllers can either be used separately or combined. This circuit contains semiconductor op-amps for the entire control.

The gain-reduction element is followed by a tube-based push-pull amplifier with variable gain up to 30 dB. A dedicated Bus selector with three positions (Off, Bus 1, Bus 2) is used whenever you want to link several compressors together. Input and output transformers have a static-screen between the primary and secondary wirings. Both Input and Output are balanced as well as fully floating.

  • Unique low distortion gain-reduction element
  • All tube-based push-pull amplifier
  • Multiple interconnection of several compressors via two busses
  • VU-meter for monitoring input, compression and output
  • Continuously variable attack and release time
  • Gain Range (off to +30 dB)
  • Variable Threshold (off to -40 dBu)
  • Frequency response @ -3 dB: 5 Hz to 25 kHz
  • Low noise: < -75 dBu @30 dB gain
  • Clickless bypass switch

Additional Media

Signal Processing Buying Guide

Tech Specs

Number of Channels 1
Controls Gain, Ratio, Threshold, Attack, Release
Threshold -40 dB to 0 dB
Ratio 2:1 to 10:1
Frequency Response 5Hz-25kHz (-3 dB)
Side Chain Inserts Yes
Inputs 1 x XLR
Outputs 1 x XLR
Sidechain I/O 2 x 1/4"
Rack Spaces 3U
Height 5.25"
Depth 6.7"
Width 19"
Weight 9 lbs.
Manufacturer Part Number CL 1B

Customer Reviews

Based on 10 reviews
Write your review

Awesome Comp With Lots of Color

Great comp with lots of color. I love it on vocals!
Music background: Studio / Live Engineer

Tube-Tech Reviews

This unit is perfect for what I want. Good investment for my homestudio. Alex thanks for your support and Sweetwater. If you do not speak English well, Alex is the man in Sweetwater who can help you with your purchase.

CL1B Compressor

I love this compressor. Personally I am not a fan of the stock tubes, I replaced my JJ stocks with telefunkens and spare pair just incase. This unit is great for vocals and bass GTR. I do mostly hip hop recordings so this compressor gets a workout mostly on vocals. My usual setting for this unit is set to fixed with about 10 db of gain and -15 on the threshold with about 6:1 on the ratio. It sounds smooth and silky like butter.
Music background: Recording Engineer, Recording Artist, Music Producer

gorgeous vocal and bass compressor

simply put, the most beautiful sounding vocal compressor ever made. any vocal you run through it comes out controlled and with a smooth sheen that cannot be found anywhere else. i also love tracking bass through it.. believe it or not, my minimoog through this thing and into an api 5500 sounds ridiculously good!
Music background: producer and engineer

Tube-Tech CL 1B

You can hear a major difference in this piece of equipment while using it on vocals. It's an amazing piece of equipment to have. I've been getting great results from artist coming through my studio loving the sound quality and presence that it has while recording their tracks. I'd prefer anyone to buy one.
Music background: Recording Engineer

Sweetwater Advice

Thomas Leahy

Back in Nashville, I used the Tube-Tech CL 1B on vocals and found it glues the top end together with a characteristic texture that's unique to even among similar compressors. In most ways, it's a classic tube-based optical compressor, but its added versatility really makes it stand out.
See also: Compressors, Tube-Tech, Tube-Tech Compressors / Limiters, Tube-Tech Compressors / Limiters