Universal Audio 710 Twin-Finity Microphone Preamplifier

Double your mic pre with the 710's two discrete, blendable gain stages: a tube circuit dripping with character, and a solid-state path with crisp response.

Getting a Universal Audio 710 TwinFinity Pre-Amp is almost like getting three distinct high-end pre-amplifiers in one unit. That's because its unique design has both vacuum tube and solid state gain stages that be used separately, or in tandem. This gives you options for classic tube warmth or solid-state clarity of sound. And then, a whole host of other tonal possibilities when you mix these two voices via a single, clever mix knob. And the fact that it costs far less than many other professional-grade preamps makes it an exciting option for musicians searching for new amp tones.

Learn more with this video from Universal Audio:

Get an overview of the Universal Audio 710 Twin-Finity Microphone Preamplifier in this video demo:

Tube and/or Solid-Stage Gain Stages

The UA 710 TwinFinity's ingenious circuit design utilizes a trans-impedance amp to drive two discrete and blendable vacuum tube and solid-state gain stages. On the tube end, the 710 TwinFinity's 310 Volt triode circuit delivers the sound of a fine vintage circuit, giving way to a characteristic and crunchy bite at the higher end of the gain stage. The solid-state path, meanwhile, will deliver an ultra-clear and cool response, with exceptional transient response in situations as diverse as vocal tracking or overhead cymbal micing.

Infinite Blending

The preamp's tube and solid-state signal paths meet in the "Blend" section on the front panel, where a single knob allows for an endless smooth blending of the read more two phase-aligned signals. The design is super straightforward, with a single XLR in (with phantom power), a balanced line in, and an XLR output.

Handsome, Too

The design is all-metal with a polished steel face and sports a handsome backlit meter bar, all in one half-rack chassis. The meter also features a cool "Drive" mode that allows you to see how hard your signal is actually hitting the pre-gain stage -- a handy tool for when you're crafting your sound.

A Great Tool in Your Rig

This essential and versatile preamp will bring depth and color to just about anything you throw at it -- vocals, guitars, drums, and more. The 710 will make microphones you thought you knew sound fresh and new. Plus, it will serve excellently as a high-end DI in situations with electric guitars or keyboards.

A Well-Bred Preamp

With products designed and hand-built in the USA, Universal Audio is a company with a reputation for laborious product development and absolutely top-of-the-line manufacture. The 710 TwinFinity embodies this proud tradition -- and like other UA products, this is a professional device offered at an extremely reasonable price. This amp will immediately become an often used and indispensable piece of gear in the studio of any musician or engineer looking to enrich their tonal possibilities.


- Serves as Tone-Blending Mic/Line Preamp and Instrument DI
- Dual-Path 310 volt Class-A Tube and Trans-impedance amplifier
- Phase-Aligned and blendable Tube and Solid State signals
- Dual gain stages
- Front Panel Hi-Z Input
- 2.2M ohm Ultra Hi-Z impedance for DI applications
- Rear Panel XLR Mic Input, XLR Line Input and XLR Line Output
- Single Balanced output stage
- 70dB of gain
- Phantom power
- Pad(-15dB), Phase Invert, and Low Cut Filter
- Output and "Drive" backlit VU metering
- Portable, Rack-Mountable in one half-rack chassis
- 19-inch Rack Kit included
- Internal Power Supply
- Heavy-Duty Steel Construction
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- Inputs: Microphone (Female XLR), Balanced: Line (Female XLR), Unbalanced: Instrument (1/4 inch jack) (D.I.)
- Outputs: Balanced Line (Male XLR)
- Type: Tube & Solid-State Phase-Aligned Tone-Blending Mic Pre & DI
- Tube Complement: 12AX7
- Pad: -15dB
- High Pass Filter: 75Hz
- Maximum Power Consumption: 160mA @120VAC 20W
- Power Requirements: 100-240VAC
- Dimensions (WxHxD): 8.45 x 3.5 x 10.25 in.
- Weight: 5.25 lb Mic Input Impedance: 2K ohms
- Line Input Impedance: 10K ohms
- Hi-Z Input Impedance: 2.2M ohms
- Internal Output Impedance 600 ohms
- Gain Range for Unit: -Infinity to 70dBu
- Mic Range Gain Pot: 10 ~ 60 dBu
- Line Range Gain Pot: -10 ~ 40 dBu
- Hi-Z Range Gain Pot: -10 ~ 40 dBu
- Maximum Mic Input Level Gain @min SS: +18 dBu
- Maximum Mic Input Level Gain @min Tube 1% THD: -7 dBu +8 dBu w/pad
- Maximum Line Input Level Gain @ Min SS: +30
- Maximum Line Input Level Gain @ Min Tube 1% THD:+8 dBu
- Maximum Hi-Z Input Level Gain Min SS: +18
- Maximum Hi-Z Input Level Gain Min Tube 1% THD: +8 dBu
- Maximum Output Level into 600 ohms: +18 dBu
- Maximum Output Level into 100k ohms: +28 dBu
- Tube Clipping Level: Same as Max In
- Solid-State Clipping Level: Same as Max In Mic Frequency Response: 20Hz to 100kHz +/- 0.2 dBu
- Line Frequency Response: 20Hz to 100kHz +/- 0.2 dBu
- Hi-Z Frequency Response: 20Hz to 100kHz +/- 0.2 dBu
- Min THD+Noise @ +4dBU: 0.1% tube 0.005% solid-state
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 9.5 lbs
Shipping Dimensions: 15 x 12 x 6 in
Manufacturer Part Number (MPN): 710TF-D

For support or warranty questions, please contact the manufacturer:
Phone: 831-440-1176
Web: https://help.uaudio.com/

Universal Audio 710 Twin-Finity Mic Pre

The 710 Twin-Finity is a radically UA pre-amp design which uniquely combines both the classic retro warmth of UA tube design and the transient bite of solid-state in a 2U, half-rack, all-metal chassis. The 710 was created specifically to add the tonal versatility and sonic inspiration missing from generic audio interface preamps.


- Twin-Finity(TM) Tone-Blending Mic/Line Preamp & Hi-Z Instrument DI
- Dual-Path 310 volt Class-A Tube and Transimpedance Solid State Preamp
- Phase-Aligned "Tone-Blending" of Tube and Solid State
- Dual Gain Stages: Wire with Gain to Creamy to Crunchy
- Discrete JFET DI with 2.2M ohm Ultra Hi-Z impedance
- Monolithic Balanced Output Stage

The key to its sonic flexibility lies in its innovative circuit design, featuring a solid-state transimpedance input amp simultaneously driving separate, phase-aligned tube and solid-state gain stages, which are then summed to a single output.. The mix between the 310 volt single-ended class-A triode tube stage and solid-state transimpedance stage is controlled via the "Blend Knob" labeled "()()". Blending is continually variable between 100% tube and 100% solid-state offering a practically infinite range of unique pre-amp tones and the ability to easily dial-in your own signature sound.

Like all our other preamp designs, the 710 features dual gain-stage controls (Gain/Level) which can radically vary the amount of coloration and distortion by allowing you to crank up the input gain like a guitar amp. The VU meter features a unique "Drive" mode allowing you to see how hard you are driving the input stage.

Versatility makes the 710 the perfect preamp partner for any mic collection. Plus, the discrete JFET DI input circuit can also easily handle any electric instrument. Guitar and bass players will especially appreciate the 710s ability to bring out the best of both active and passive pickups. The 710 Twin-Finity is designed and built at UA headquarters in California, and includes a 19" rack-kit for mounting one or two units.

Reviewers gave this product an overall rating of 4.5 out of 5 stars. (26 ratings)
Submitted January 8, 2016 by nathan w in jonesboro, AR

"i love it"

Overall: 4.5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
even though i run this into a focusrite 2i2, the Ua-710 has made a HUGE difference in sound compared to that interfaces stock preamps.....the sound i hear thru my headphones while tracking has so much more body and clarity...it's actually inspirational. I mic'd up my acoustic with an sm-57 into this preamp, and it gave my acoustic so much more warmth and body... when i listen to the track i recorded with the 57 on my car stereo, the warm bass frequencies of my mahogany bodied acoustic really kind jump out of my speakers...

Musical Background:

been playing 28 years now.. mostly at home, some cover band experience

Musical Style:

rock, country, blues, reggae... anything that features a lot of guitar
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