Unison Research Reference Pre | Line and phono tube preamplifier | 2 YEAR WARRANTY

Name: Unison Research Reference Pre | Line and phono tube preamplifier | 2 YEAR WARRANTY
Brand: Unison Research
Price: 18999.00 CHF
Availability: BackOrder

Reference 73765

CHF18,999.00 Tax included

Supplier stock – typically 4 to 7 days

Unison Research Reference Pre, a two-chassis line and phono tube preamplifier. 300B triodes, pure class A, RCA and XLR inputs and two phono inputs with selectable loading.

Color : Red

Red
Walnut

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Supplier delivery time usually 4 to 7 days

Description
Product Details

Tube preamplifier seen from the front, wooden cheeks and two large round black covers

Reference series preamplifier

Unison Research designed the Reference Pre after its Reference monoblock power amplifiers, to pair them with a preamplifier of the same standard. It is a dual mono tube preamplifier, split across two chassis and working in pure class A. It comes in a Cherry or Walnut finish.

Wooden front with metal volume and selector knobs, close-up view

Line and phono inputs

Four RCA inputs, two XLR and a tape input take the line sources, with an impedance of 47 kΩ and 20 dB of gain. Two independent phono inputs complete the set, with selectable load resistance and capacitance. The phono stage offers 45 to 55 dB of gain and passive RIAA equalisation within ± 0.2 dB.

300B triodes and small tubes on a stainless steel chassis, wooden cheek in the foreground

300B and 6C45P tubes

The line section uses two 300B triodes with ECC82, ECC83 and 6C45P tubes, while the phono stage uses four 6C45P and two ECC83. Bandwidth runs from 10 Hz to over 100 kHz at -0.3 dB, with 0.1 % distortion. Feedback is 15 dB on the line stage and zero on phono.

Rear panel with XLR sockets, gold-plated RCA sockets, blue impedance selectors and mains inlet

Active outputs and power control

The rear panel holds one RCA output, one XLR output, an active tape output and an active subwoofer output, with an output impedance of 500 Ω. A link switches on the Reference power amplifiers. The preamplifier draws 320 W at most, measures 45 x 56 x 22 cm (W x D x H) and weighs 30 kg, with a 2-year warranty and 3 months on the tubes.

Red = Cherry; Walnut = Walnut

Reference 73765

Data sheet

Product Type: Preamplifier
Brand: Unison Research
Audio outputs: 1 RCA, 1 XLR, 1 tape (active), 1 subwoofer (active)
Integrated phono: Yes
Number of channels: 2
Analog inputs: 4 RCA, 2 XLR, 1 tape
Subwoofer output: Yes
Phono inputs: 2 independent phono inputs
Color: Cherry Tree
Walnut
Technology: Feedback: 15 dB line, 0 dB phono
Input impedance: 47 kΩ
Line gain: 20 dB
Output impedance: 500 Ω
Passive RIAA ± 0.2 dB
Phono gain: 45 - 55 dB
Phono input impedance: selectable resistance and capacitance
Phono tubes: 4 x 6C45P, 2 x ECC83
Tubes: 2 x 300B, 2 x ECC82, 4 x ECC83, 6 x 6C45P
Two-chassis construction
Series: Reference Series
Connections: Power-on link for the Reference power amplifiers
Amplification technology: Dual mono
Pure class A
Power consumption: 320 W max
Frequency response: 10 Hz - over 100 kHz (-0.3 dB)
Distortion (THD): 0.1 %
Width: 45.0 cm
Depth: 56.0 cm
Height: 22.0 cm
Unit weight: 30.0 kg