Retro Instruments Sta-Level - All-Tube Vari-Mu Compressor
The Retro Instruments Sta-Level is a faithful recreation of the legendary Gates Sta-Level tube compressor - a studio classic first introduced in the 1950s and loved for its smooth, warm, and musical compression.
Retro Instruments has meticulously re-engineered the original design with modern reliability, matched tubes, and custom transformers while retaining the distinctive vintage tone that made the Sta-Level a favourite for vocals, bass, and full mixes.
This all-tube, programme-dependent compressor delivers the creamy, cohesive sound that defined countless hit records, now ready for today's hybrid studios.
Key Features
- Authentic all-tube vari-mu design based on the original Gates Sta-Level circuit.
- High-voltage Class A operation for rich harmonic saturation and low distortion.
- Programme-dependent attack and release with three selectable recovery modes (Single, Double, Triple).
- Custom-wound transformers deliver smooth frequency response and balanced tone.
- Continuously variable Input and Output controls for fine gain staging and compression depth.
- Link function allows stereo operation using two Sta-Level units.
- True vintage sound ideal for vocals, bass, drums, and mix bus applications.
- Hand-built in the USA with premium components and matched NOS tubes.
Applications
- Vocals: Delivers silky, consistent level control with vintage tube smoothness.
- Bass: Adds depth, warmth, and sustain without flattening dynamics.
- Drums: Brings punch and glue with musical, programme-dependent response.
- Mix Bus: Creates natural analogue cohesion and weight to the entire mix.
Technical Specifications
| Unit Type | All-Tube Vari-Mu Compressor / Limiter |
|---|---|
| Circuit Type | Class A, variable-mu tube design based on Gates Sta-Level |
| Compression Type | Programme-dependent vari-mu (Single, Double, Triple timing) |
| Controls | Input Gain, Output Gain, Mode Selector, Bypass, Stereo Link |
| Attack Time | Programme-dependent (approx. 1-10 ms) |
| Release Time | Programme-dependent (approx. 0.3-5 s) |
| Frequency Response | 20 Hz - 20 kHz ±0.5 dB |
| THD + N | 0.05% typical (1 kHz @ +4 dBu) |
| Max Gain Reduction | Up to 20 dB |
| Input/Output Impedance | 600 Ω balanced |
| Transformers | Custom Retro Instruments input and output transformers |
| Tubes | Matched NOS 6386 dual-triode tubes or Retro's equivalent tube set |
| Power Supply | Internal universal power supply (100-240V AC) |
| Form Factor | 2U rackmount chassis |
| Weight | Approx. 7.8 kg |
| Origin | Hand-built in the USA by Retro Instruments |
Why Choose the Retro Instruments Sta-Level?
The Retro Instruments Sta-Level is the definitive version of one of the most beloved compressors ever made.
It combines the unmistakable warmth, thickness, and musicality of vintage tube compression with the consistency and reliability modern engineers demand.
Perfect for vocals, bass, or mix bus duties, the Sta-Level remains a benchmark for organic analogue compression - smooth, musical, and deeply inspiring.
