175B & 176 Tube Compressor Collection

Universal Audio's software emulation of the legendary 175B and 176 tube compressors brings authentic gain reduction character to modern digital workflows. Originally designed by Bill Putnam Sr. in the early 1960s, these units pioneered the fast attack limiter concept and remain among the most sought-after compressors on the vintage market, with original units commanding five figures in today's market.

The plugin captures the essential sonic architecture of Putnam's feedback compression topology, which produces characteristically soft compression at lower input levels while transitioning to near brickwall limiting at higher thresholds. The dual Attack and Release controls, revolutionary for their era, provide independent adjustment of compression behavior across the dynamic spectrum. The tube amplifier's natural harmonic saturation and transformer coloration are accurately modeled, delivering the warm, musical density these units are known for rather than clinical dynamic control.

Sonically, the 175B and 176 occupy a middle ground between the Fairchild's smooth musicality and more straightforward VCA designs, offering greater control flexibility alongside organic tube character. This makes them equally effective on vocals, drums, bass, and full mixes, though they excel particularly on sources benefiting from both transparent and aggressive compression depending on input level.

The plugin's real-time operation on any soundcard removes previous hardware limitations, making these masterpieces accessible to studios without the space or budget for vintage units. For engineers seeking period-accurate compression with genuine tube saturation rather than emulated alternatives, the 175B and 176 Collection represents the most direct path to Putnam's original vision in plugin form.