Fidelity Imports

Unison Research Simply 845

$10,999.00
Frais d'expédition calculés à l'étape de paiement.

"There are two words that come to mind with the 845... timing and detail." - HiFi Pig Review

Quite Possibly Your Last Amplifier

The Unison Simply 845 is the result of years of design experience, in-depth knowledge of electronic tubes, and Unison Research's passion and desire to make "unique" pieces of audio gear that are also a great value. Their design embodies traditional craftsmanship and high performance technology that will satisfy the most ardent music lover.

The Simply 845 ranks at the top of Unison Research's line of integrated tube amplifiers. The SIMPLY 845 employs the famous 845 direct-heated triodes, tubes well known for remarkable durability and extraordinary sonic qualities. The large tubes (nearly 8 inches from top to pins) need to be handled carefully, so gloves are included. They definitely get hot so it is highly recommended to use the tube cage included with the amp.

About

The integrated amplifier uses the 845 tube in a direct heated triode mode. They are self biasing, so no need to manually adjust. The Class A preamp stage also incorporates 4x ECC82/12AU7 tubes,

Transformer: A good output transformer is not only the result of a rigorous design, but also the choice of materials particularly suited to act linearly with the intense magnetic and electric fields interacting within it. As such, the transformers in the Simply 845 are hand made in-house.

The Simply 845 transformer uses very thin Mylar and Polypropylene insulators suitable to contain parasitic capacitance and dispersion of magnetic fluxes as much as possible thus achieving an extended frequency range and very low harmonic distortion.

In addition, the ferromagnetic core employed is considerably different from cores commonly used in audio products and consists of a stack of thin laminations of a special alloy of iron and silicon all insulated from each other, the molecules of which are oriented and fixed in a stable manner to facilitate the flow of the lines of force of magnetic fields.

Circuits

All stages of the Simply 845, both the preamplifier and power output, operate in pure class A mode. The preamplifier circuits are fed by stabilized linear-type electronic power supplies designed specifically to minimize interference with mains noise.

In the electronic circuits, all capacitors affected by the audio currents are anti-inductive with armatures insulated by polypropylene dielectrics, the ultimate in current technology. The printed circuit boards used are not of the normal industrial type, but differ in having fiberglass backing, and pure electrolytic copper traces three times as thick as the standard.

The volume potentiometer plays a very important role in high sound quality, and for this reason our choice fell on the famous RK27 motorized Japanese-made ALPS.

Reviews

Specifications

  • Type: Integrated Valve Amplifier
  • Valves : 2 x 845 Selected 4 x ECC 82 / 12AU7 selected
  • Class : Class A Output stage topology: Single-ended
  • Maximum Power : 23W
  • Bandwidth: 20Hz-50kHz, +0dB -1dB @ 12W
  • Feedback Level : 14 dB
  • Output impedance: 6 Ohm
  • Input impedance: 47 Kohm / 100 pF
  • Input: 4 line level Outputs: 1 Tape, 1 Subwoofer
  • Power Consumption: 300VA
  • Size: 37 cm x 26 cm x 57 cm ( L x H x D ) 14 1/2 x 10 1/4 x 22 1/2 inch
  • Weight: 30,5 kg - 67 Ibs
  • Main Fuses: 5x20mm – 6.3 AT 100V-120V