Tube-Tech CL 1B – Tube Optical Compressor for Professional Audio

The Tube-Tech CL 1B is a legendary all-tube optical compressor known for its smooth, musical compression and transparent signal preservation, even at extreme settings. This unit has become the go-to vocal compressor for professional recording engineers, making it a staple in major studios worldwide.

The Gold Standard for Vocals and Instruments

From vocals to guitars, bass, and keyboards, the CL 1B delivers precise, natural compression that enhances a track without adding muddiness or distortion. Its intuitive operation allows you to dial in perfect settings quickly, ensuring optimal dynamics without compromising clarity.

Key Features

• All-Tube Optical Compression – Warm, smooth dynamic control
• Transparent Sound – Maintains clarity even at high compression levels
• Variable Ratio (2:1 to 10:1) – Flexible compression settings
• Continuously Adjustable Attack & Release – Full control over response times
• Transformer-Balanced Input & Output – Ensures high-fidelity signal transmission
• Dual Time Control Modes – Fixed or variable Attack/Release for precise shaping
• Bus Linking – Link multiple units for stereo or multi-channel compression
• Versatile VU Meter – Switchable between Input, Compression, and Output levels

How Does the CL 1B Sound?

The Tube-Tech CL 1B is widely regarded as one of the most musical compressors ever made. Its ability to smoothly control dynamics while preserving the original tonal character makes it a favorite for top-tier vocal production in genres like Hip-Hop, R&B, Pop, Rock, and beyond.

Technical Specifications

• Compression Type: Optical (Tube-Based)
• Frequency Response (-3 dB): 5 Hz – 25 kHz
• Noise Level: < -75 dBU at 30 dB gain
• CMRR: > 60 dB at 10 kHz
• Ratio: 2:1 to 10:1 (Variable)
• Attack Time: Continuously variable
• Release Time: Continuously variable
• Output Gain: Off to +30 dBU
• Threshold: Off to -40 dBU
• Input Impedance: 600Ω
• Interconnection: Bus 1 / Bus 2 linking for multiple units
• Metering: VU Meter (Input, Gain Reduction, or Output)

Built for Professional Recording

The CL 1B is trusted by industry professionals for its ability to shape dynamics naturally. Whether used for subtle leveling or heavy compression, it remains one of the most versatile and sought-after compressors in the world.