Tegeler Audio Vari Tube Compressor

The Tegeler Audio Vari Tube Compressor (VTC) is a Vari-Mu stereo bus compressor built around a fully tube-driven, Class-A signal path—4 triode tubes and 3 transformers per channel—designed for mastering, mix bus, and tracking applications where character and precision both matter. Patterned after the Vari-Mu compression topology made famous by the Fairchild 670, the VTC engages compression gently at low settings and increasingly at higher input levels, preserving transient liveliness and micro-dynamics even under significant gain reduction. A sidechain high-pass filter keeps low frequencies from triggering pumping artifacts, and all controls use 42-step potentiometers for repeatable, session-accurate recall. For Los Angeles mastering engineers and mixing engineers working on full stereo mixes, buses, or solo instruments, the Tegeler Audio VTC brings warmth, definition, and cohesion that remains difficult to replicate in the box.

Key Features

• Vari-Mu compression circuit — Class-A, all-tube signal path — 4 triode tubes and 3 transformers per channel drive the entire signal path, producing the harmonic saturation, defined low end, and rounded high frequencies characteristic of classic Vari-Mu designs.
• Gentle, musical compression behavior — compression engages softly at low settings and increases progressively at higher input levels, maintaining the liveliness and micro-dynamics of the mix even at up to 6 dB of gain reduction without audible pumping.
• Sidechain high-pass filter — reduces the compressor’s sensitivity to low frequencies, preventing bass-heavy program material from triggering unwanted compression artifacts and keeping the dynamic response consistent across the full mix.
• Color/Comp switch — compression can be disabled entirely, allowing the VTC to be used purely as a tube and transformer coloring stage; the input control then sets the desired level of tube saturation without engaging compression.
• Bypass switch — removes the unit completely from the signal path for direct A/B comparison.
• Stereo or dual mono operation — a link switch decouples both channels for independent processing of two separate signals, making the VTC equally useful on subgroups, individual instruments, and the full mix bus.
• 42-step potentiometers on all controls — every knob is fully detented for precise, repeatable settings across all input, output, attack, and release controls.
• Transformer-balanced XLR inputs and outputs — all connections are fully balanced via transformer, with a maximum output level of +24 dBu and input impedance of ≥2.4 kΩ.

Specifications

• Format: 3U rackmount
• Dimensions: 3U × 19.02″ W × 9.84″ D (H: 5.20″)
• Frequency Response: 20 Hz–24 kHz
• Maximum Input Level: +20 dBu
• Input Impedance: ≥2.4 kΩ
• Output Impedance: <600 Ω
• Maximum Output Level: +24 dBu
• Dynamic Range: ≥95 dB
• Voltage: 230 V~/50 Hz or 115 V~/60 Hz
• Fuse: 500 mA slow-blow
• Maximum Power Consumption: <25 W