UNISON RESEARCH PHONO ONE PHONO PREAMPLIFIER - OPEN BOX
CLEAR DYNAMIC EXPRESSIVE AND ENGAGING
OPEN BOX unit in excellent condition.
1yr. limited warranty, 30 days on tubes.
The original Phono One was one of the most popular Unison Research products in their history. Its production was discontinued a few years ago, but the requests to bring it back were overwhelming. That’s why Unison have introduced its return, with a new and improved design. The gorgeous aesthetics of the Phono One remain unchanged, maintaining the classic and timeless look of the original. However, the internal circuitry has been substantially upgraded. The Phono One, from the beginning, was designed for those who require a phono preamplifier that offers the highest possible sound quality. The new Phono One earns its place as Unison Research's flagship phono stage in part because of the 5 x ECC83 (12AX7) valves.
All of the gain stages now implement a parallel configuration for the best low-noise and low-distortion performance. This solution also increases the overall cartridge gain ability to approximately 54dB; easily enough for a wide variety of Moving Magnet (MM) and Moving Coil (MC) cartridges. The same passive RIAA network as found in the original Phono One has been adopted, but with specially selected components that ensure strict tolerances to the equalization curve.
A delayed muting function is built into the phono stage to avoid potential problems with DC voltages and 'bump' (or 'pops') during warm-up and switch-off; this also means you won't hear any music until the valves are running at their optimum temperature, so the sound performance is always its best.
As opposed to the Simply Phono, where only the resistive component of input impedance is changeable, with the Phono One you can change both the resistance and the capacitance to perfectly match the requirements of your chosen cartridge.
Particular care has been dedicated to the power supply design in order to minimize cross-talk and inter-stage interference. Combine this with the elastic suspension of the amplifier board and optimised circuitry throughout, and the result is superlative sonic performance, full of natural detail and musical clarity.
Listening to Esperanza Spaulding's, The Peacocks, "...the Phono One presents the instruments in space and in a beautiful front-to-back fashion. The drum kit exhibits tremendous attack, while the cymbals show intricate detail without distracting from the rest of the mix."
- Tone Audio, AnalogAholic, Jerold O'Brien
- Type: Stereo Phono Valve Preamplifier
- Class: pure A
- RIAA : passive +/- 0.1 dB (20 Hz / 20 KHz)
- Output Impedance: 800 ohm.
- Outputs: 1 x line
- Gain : 54 dB
- Total Harmonic Distorti on (THD): 0.1 % at 1 volt output
- Signal to Noise Ratio (S/N): – 80 dB
- Inputs: 1 x MM or MC
- Input Impedance: 47 Kohm – 100 – 50 – 22 ohm / 100 – 200 – 320 – 420 pF (modifiable)
- Feedback Factor: 0 dB.
- Valves: 5 x ECC83 (12AX7)
Dimensions: 14.7 w x 9.7 d x 5.8 h in.
Weight: 8 lbs.
Warranty: 1 yrs. limited electronics, tubes: 30 days
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SHIPPING: The shipping weight of the Unison Phono ONE is 12 lbs. Shipment by FEDEX Home Delivery/Insured is FREE if your delivery addresses is within the 48 continental states. If your delivery address is in Alaska, Hawaii, Canada or other location outside of the USA, please call (480) 607-2277) or email email@example.com to determine the shipping cost and to place your order. Duties, taxes and fees on shipments to destinations outside of the USA are NOT included in the price.