Overview

The Universal Audio 710 Twin-Finity is a single-channel microphone preamp that offers a unique dual-topology design, combining a tube gain stage and a solid-state gain stage with a continuously variable blend control that allows engineers to dial in any ratio of warmth to clarity for each recording situation. The tube side uses a genuine 12AX7 vacuum tube running at full voltage for authentic tube saturation and harmonic richness, while the solid-state side provides clean, transparent amplification with fast transient response. The blend knob between these two topologies is the 710's defining feature, enabling engineers to find the perfect tonal sweet spot for each vocalist or instrument without committing to a single preamp character. The UA-designed output transformer adds subtle harmonic enhancement and the robust, punchy sound that has defined Universal Audio products since the company was founded by Bill Putnam Sr. in the 1950s. Front-panel controls include gain, output level, low-cut filter, polarity inversion, and phantom power, with a comprehensive VU meter for visual monitoring. The Hi-Z instrument input accommodates direct guitar and bass recording. Build quality is exceptional with a heavy-gauge steel chassis and premium components throughout. The 710 Twin-Finity is ideal for project studios and professional engineers who want the flexibility to move between tube warmth and solid-state clarity without changing hardware. The single-channel limitation means tracking multiple sources simultaneously requires additional preamps, and the tube will eventually need replacement after extended use.

Preamps

Single-channel preamp with unique dual tube/solid-state topology and blend control, plus UA-designed output transformer for classic Universal Audio character.

Instrument Details

$699 Intermediate
Brand Universal Audio
Type Hybrid Tube/Solid-State Preamp
Made In United States
Year 2009
4.6 1 vote

AI Reviews

4.6 /5

The 710 Twin-Finity is a masterclass in versatility for the modern project studio. While Universal Audio is often associated with high-end vintage clones, the 710 is a forward-thinking workhorse. Its standout feature"the phase-aligned blend knob"allows you to sweep from clinical, high-fidelity solid-state clarity to the saturated, harmonically rich warmth of a 12AX7 tube stage. This isn't just a gimmick; it's a powerful tool for tailoring the 'speed' and 'weight' of a signal in real-time.

On percussion or acoustic guitars, the solid-state side offers the fast transient response needed for detail. Conversely, cranking the tube side adds a pleasing 'glue' and harmonic grit to vocals or DI bass. Speaking of DI, the front-panel JFET input is exceptionally punchy and rivals many dedicated boutique DI boxes.

Build-wise, it's a tank, though the half-rack form factor can be a bit awkward in a standard desk setup without the optional rack kit. My only minor gripe is that the tube saturation can feel slightly less 'airy' compared to UA's higher-end 610 series, but for the price, the flexibility is unbeatable. It's the ideal choice for the intermediate engineer who needs one reliable preamp to handle everything from clean voiceovers to aggressive rock guitars.

Category Ratings

Preamps
4.6
Feb 15, 2026
AI-Generated Review Generated via Google API. This is an automated evaluation, not a consumer review. Learn more
Universal Audio 710 Twin-Finity Screenshot

Added: Feb 14, 2026

uaudio.com/hardware/mic-preamps/710-twin-finity.html

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