Universal Audio 710 Twin-Finity
Universal Audio

710 Twin-Finity™ Tone-Blending Mic Preamplifier

Get tube and solid-state sonics and everything in-between with this unique mic pre/DI.
Now You Can:
  • Twin-Finity™ 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
  • 70dB+ of gain, +48V Phantom, Pad(-15dB), Phase Invert, and Low Cut Filter(75Hz)
  • Output and "Drive" backlit VU metering
  • Portable, Rack-Mountable design for Studio, Desktop or Stage
  • 19” Rack Kit Included
  • Front Panel Hi-Z Input (switched from Mic/Line automatically via Jack Detect)
  • Rear Panel XLR Mic Input, XLR Line Input and XLR Line Output
  • Universal Internal Power Supply
  • Heavy-Duty Metal Construction

  • Overview
  • Tech Specs

Get tube and solid-state sonics and everything in-between with this unique mic pre/DI.

The 710 Twin-Finity from Universal Audio is a single channel, dual path microphone preamplifier that includes an instrument direct inject (DI) input. The dual path design combines the "warmth" of a high-voltage vacuum tube design with the clarity of a solid-state circuit. A blend control allows the dialing-in of either circuit or a combination of both in varying degrees.

The tube circuit utilizes a 310V single ended, Class-A triode tube stage, which is phased aligned with a solid-state gain stage. Both stages are fed from a variable gain solid-state transimpedance input amplifier, and are summed to a single output according to the setting of the blend knob. Along with the variable input and output controls, this design allows for an almost infinite range of tones to be dialed-in.

The discrete JFET DI input circuit can handle virtually any electric instrument, including guitars and basses with both active and passive pickups. The VU meter can switch between displaying standard output levels and a "Drive" mode that allows for seeing how hard the input stage is being driven. Phantom power, low pass filter and a polarity flip switch add full functionality to a versatile preamplifier.

Inputs Microphone (Female XLR)
Balanced Line (Female XLR)
Unbalanced Instrument (1/4" jack) (D.I.)
Outputs Balanced Line (Male XLR)
Tube Complement 12ax7
Pad -15dB
High Pass Filter 75Hz
Maximum Power Consumption 160mA @120VAC, 20W
Power Requirements 100-240VAC
Impedance Mic Input Impedance
2K ohms

Line Input Impedance
10K ohms

Hi-Z Input Impedance
2.2M ohms

Internal Output Impedance
600 ohms 600 ohms
Gain/Levels 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
Frequency Response 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
Distortion Min THD+Noise @ +4dBU
0.1% tube 0.005% solid-state

  • 8.45W x 3.5H x 10.25D

  • 5.25 lb