The audio world is abuzz with the launch of Heritage Audio's Tubestrip, an all-tube channel strip that promises to revolutionize the way we process audio signals. This 3U rack unit packs a punch with its morphing capabilities, transformer-coupled signal path, and a host of vintage-inspired processors. But is it just another tube preamp, or something more?
A Morphing Preamp
At the heart of the Tubestrip is its tube preamp, which Heritage Audio describes as having 'morphing capabilities'. This means that the preamp's tonal character can be adjusted to suit the source material, whether it's a microphone, instrument, or line-level signal. This flexibility is achieved through the use of NOS (New Old Stock) vintage tubes, which provide a warm, characterful sound that can be tailored to the musician's needs.
What makes this particularly fascinating is the use of four custom-wound transformers at the input, output, and both sides of the Vari-Mu stage. These transformers ensure that the signal remains transformer-coupled throughout the process, preserving the integrity of the audio and providing a smooth, musical response.
Inductor EQ for Character
The Tubestrip's EQ section is where things get interesting. Instead of using capacitors, Heritage Audio has opted for inductors, which provide a more musical and characterful response. This is a nod to classic outboard designs, and it's a refreshing change from the typical capacitor-based EQ found in many modern processors.
Vari-Mu Compression with a Twist
Compression is handled by a full Lang P.LANE Vari-Mu circuit, with the Seawell mode built in as an additional character option. Vari-Mu compression is a tube-based approach where the ratio shifts with signal level, providing a program-dependent response that works well across a wide range of material. This is a powerful tool for shaping the sound, and the single-knob 1B mode offers fixed, transparent compression for more controlled results.
De-essing for Sibilance Control
Rounding out the processors is a de-esser, which handles sibilance without the need for a separate unit in the chain. This is a welcome addition, as sibilance can be a challenging issue to manage, especially in vocal recordings. The de-esser ensures that the audio remains clear and free of harshness.
A Transformer-Coupled Journey
The full signal path of the Tubestrip stays in the tube domain from input to output, ensuring a warm and musical sound. NOS tubes handle the preamp and Vari-Mu stages, while JJ tubes cover the output. The four custom-wound transformers run throughout, providing a smooth and transformer-coupled signal flow.
A Bold Move for Heritage Audio
Heritage Audio describes the Tubestrip as its most ambitious outboard piece to date, and it's easy to see why. This channel strip combines a wealth of vintage-inspired processors in a single rack unit, offering a unique blend of character and versatility. It's a bold move that showcases Heritage Audio's commitment to pushing the boundaries of audio processing.
Final Thoughts
The Tubestrip is a fascinating piece of audio gear that offers a unique blend of vintage character and modern versatility. It's a testament to Heritage Audio's expertise and their willingness to experiment with new ideas. While it may not be for everyone, it's a must-listen for anyone interested in the intersection of vintage and modern audio processing.
What this really suggests is that Heritage Audio is a force to be reckoned with in the audio world, and the Tubestrip is just the beginning of their ambitious journey.
