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Universal Audio 710 Twin-Finity is a single-channel microphone preamplifier that blends continuously between a 12AX7 tube stage and a solid-state stage. Gain runs to 70 dBu, frequency response is 20 Hz to 100 kHz within 0.2 dBu, and it carries microphone, balanced line and unbalanced instrument inputs with a -15 dB pad and a 75 Hz high pass filter.
Turn the knob and the circuit changes from tube to solid state.
The Twin-Finity control is the whole product. A 12AX7 tube stage and a solid-state stage both run on the signal, and one knob mixes between them continuously. Distortion tells the story: minimum THD plus noise at +4 dBu is 0.1% through the tube path and 0.005% through the solid state path, so the two ends of the control are measurably different circuits rather than two voicings of one.
Input impedance differs by input: 2 kilohms on the microphone input, 10 kilohms on line, and 2.2 megohms on the high impedance instrument input, which is high enough not to load a passive bass or a vintage-output guitar.
Frequency response runs 20 Hz to 100 kHz within 0.2 dBu on both microphone and line inputs, which is well beyond the audible band and is part of why the unit handles transients the way it does. A -15 dB pad and a 75 Hz high pass filter handle loud sources and stage rumble.
Universal Audio still hand-builds this line in California to the original circuit designs rather than licensing the name out. The company was founded in 1958 by M.T. "Bill" Putnam, who designed the 1176 and the 610, and was revived in 1999 by his sons with the original schematics and, in several cases, the original test gear.
At a Glance
| Type | Single-channel tone-blending mic preamp |
| Gain stages | 12AX7 tube and solid state, continuously blendable |
| Gain range | Negative infinity to 70 dBu |
| Frequency response | 20 Hz to 100 kHz, plus or minus 0.2 dBu |
| Pad | -15 dB |
| High pass filter | 75 Hz |
| Inputs | Microphone XLR, balanced line XLR, unbalanced instrument 1/4 in. |
| Weight | 5.25 lb. |
How Different Are the Two Gain Stages?
Measurably. Minimum THD plus noise at +4 dBu is 0.1% through the tube stage and 0.005% through the solid state stage. That is a factor of twenty, so the control is moving between two genuinely different circuits rather than adding a flavor to one.
Who Is the 710 Twin-Finity For?
Project studios and engineers who want one preamp that covers both a colored and a clean front end, rather than owning two. It is also a common choice as a tube DI for bass, given the 2.2 megohm instrument input.
What Can I Plug Into It?
A microphone on the female XLR at 2 kilohms, a balanced line source on XLR at 10 kilohms, or an instrument on the 1/4 in. jack at 2.2 megohms. Output is balanced line on a male XLR.
What Are the Pad and Filter For?
The -15 dB pad handles sources loud enough to overload the input, such as a close-miked guitar cabinet or a kick drum. The 75 Hz high pass filter removes stage rumble and handling noise before it reaches the gain stage.
Connections
| Microphone input | Female XLR, 2 kilohms |
| Line input | Balanced, female XLR, 10 kilohms |
| Instrument input | Unbalanced 1/4 in. jack, 2.2 megohms |
| Output | Balanced line, male XLR |
| Pad | -15 dB |
| High pass filter | 75 Hz |
Specifications
| Tube complement | 12AX7 |
| Gain range for unit | Negative infinity to 70 dBu |
| Mic frequency response | 20 Hz to 100 kHz, plus or minus 0.2 dBu |
| Distortion | Minimum THD plus noise at +4 dBu: 0.1% tube, 0.005% solid state |
| Mic input impedance | 2 kilohms |
| Line input impedance | 10 kilohms |
| Hi-Z input impedance | 2.2 megohms |
| Pad | -15 dB |
| High pass filter | 75 Hz |
| Maximum power consumption | 160 mA at 120 V AC, 20 W |
| Power requirements | 100 to 240 V AC |
| Dimensions | 8.45 in. W x 3.5 in. H x 10.25 in. D |
| Weight | 5.25 lb. |
Why Universal Audio?
Universal Audio was founded in 1958 by M.T. "Bill" Putnam, the engineer who built the first recording console with integrated equalization and effects sends, and who designed the 1176 and the 610. The company was revived in 1999 by his sons and now does two things: it still hand-builds analog hardware in California, and it licenses and models the classics from Neve, API, Manley, SSL, Lexicon, Studer, Ampex and others rather than emulating them without authorization.
Frequently Asked Questions
Is this a genuine Universal Audio product?
Yes. Victory is a veteran owned dealer in Miami and units ship new in original packaging with full manufacturer support, including software registration rights.
Is this covered by warranty?
Yes. This unit carries the full Universal Audio manufacturer warranty, registered to you as the original purchaser. Call 844-687-4208 for the current term.
Is the tube always in the circuit?
Both stages run at once and the Twin-Finity control mixes between them. At the fully solid-state position the tube contribution is out of the blend.
Can I use it as a DI?
Yes. The unbalanced instrument input runs at 2.2 megohms, high enough for a passive bass or a vintage-output guitar.
What is the frequency response?
20 Hz to 100 kHz within 0.2 dBu on both the microphone and line inputs.
Why Buy From Victory Musical Instruments?
Victory Musical Instruments is a pro audio and musical instrument dealer in Miami, Florida. We support churches, schools, studios and working musicians across South Florida and ship nationwide. Every unit is new in the original factory packaging with full manufacturer support. Call 844-687-4208 to check lead time, request a quote, or arrange local pickup.