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Unison Research Phono One Phonostage

  code:URPHONO1
From £1,900.00 (FREE UK Delivery)
Item out of Stock  |  Usually dispatched within 24 hours
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The Phono One was originally released many years ago and enjoyed much admiration and acclaim during its life-span. After it was discontinued it's popularity did not cease, so when the vinyl hi-fi market began to experience a resurgence, Unison Research decided to re-introduce their iconic phono stage with new and improved specifications. 

The new Phono One is aesthetically similar to the original, and while it shares some similarities in circuitry with the Simply Phono it earns its place as Unison Research's flagship phono stage in part because of the 10 triodes it uses (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 the best it can be.

As opposed to the Simply Phono, where only the resistive component of input impedance is changeable, the Phono One can have both the resistance and the capacitance changed to perfectly match the requirements of your chosen cartridge.

Particular care has been dedicated to the power supply design in order to minimise cross-talk and inter-stage interference. Combine this with the elastic suspension of the amplifier board and optimised circuitry throughout, and the result is a superlative sonic performance, full of natural detail and musical clarity.

Key Features:

  • Iconic phono stage with classic aesthetic design
  • 5 x ECC83 (12AX7) valves
  • Pure Class A design
  • Stunning sound performance
  • Suitable for all high-end hi-fi systems
  • Switchable Impedance and Capacitance
  • Delayed muting function to avoid sound 'spikes' during start-up and switch-off
  • High-quality Cherry Wood or Mahogany panels

Technical Specifications:

  • Type: Pure Class A valve phono stage
  • RIAA: Passive ± 0.1dB (20Hz / 20kHz)
  • Output Impedance: 800Ω
  • Outputs: 1 x Line (RCA)
  • Gain: 54dB
  • THD: 0.1% @ 1V output
  • Inputs: 1 x RCA (for MM or MC)
  • Input Impedance: 22, 50, 100 or 47kΩ (switchable)
  • Input Capacitance: 100, 200, 320 or 420pF (switchable)
  • Feedback Factor: 0dB
  • Valves: 5 x ECC83 (12AX7)
  • Power Supply: External
  • Dimensions (W x H x D): 373 x 58.4 x 246.3mm
  • Net Weight: 3.6kg (incl. PSU)

We endeavour to despatch same day (for orders placed up to 2pm) on available stock items to the vast majority of UK mainland addresses. Please remember to check with us first for a physical stock check if next day delivery is important to you.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Free delivery also applies to the Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland but may take a day or so longer. Smaller items are delivered using Royal Mail recorded delivery or special delivery. Larger items are delivered using a courier service such as Interlink Express, DPD, UPS or DHL. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using DPD, DHL or UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Turntableworld or by the courier with a request for any further information required. Customs duties do not apply for shipments into any EU country (for a full list please refer to the EU Country List). Customs duties can apply for countries outside of the EU. Customers in these countries are responsible for all taxes and duties incurred when the items enter their country.

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