Unison Research Simply 845 | 845 integrated tube amplifier | 2 YEAR WARRANTY

73761
CHF8,799.00 Tax included
Supplier stock – typically 4 to 7 days
Unison Research Simply 845, a pure class A integrated tube amplifier. Two directly heated 845 triodes in single-ended deliver 23 W, with four line inputs and a subwoofer output.
Quantity
Supplier delivery time usually 4 to 7 days

Amplifier seen from the front, walnut cheeks and two large triodes in front of a stainless steel screen

Directly heated 845 triodes

The Simply 845 sits at the top of Unison Research's integrated tube amplifier range, second only to the Absolute 845. It shares that model's directly heated 845 triodes, known for their durability: two selected tubes, backed by four ECC82/12AU7 that are also hand-picked. The whole circuit works in pure class A.

Three-quarter view of the black chassis, the tubes and the walnut front

23 W single-ended output stage

The output stage uses a single-ended topology and delivers up to 23 W. Bandwidth runs from 20 Hz to 50 kHz (+0 dB, -1 dB at 12 W), with 14 dB of feedback and an output impedance of 6 Ω. Power consumption is 300 VA.

Steel wire protective cage over the tubes, walnut cheek in the foreground

Preamp and power amp combined

With the preamplifier and the power amplifier in one chassis, the Simply 845 does without an interconnect between the two stages, an expensive link that is never entirely neutral. Four line inputs with an impedance of 47 kΩ / 100 pF take the sources.

Rear panel with six pairs of RCA sockets, speaker terminals and mains inlet

All connections at the rear

The renewed production is more compact: every input and output socket, gold-plated and of a new type, is now grouped at the rear. A tape output and a stereo RCA subwoofer output are also there. The amplifier measures 37 x 26 x 57 cm (W x H x D) and weighs 30.5 kg, with a 2-year warranty and 3 months on the tubes.

73761

Data sheet

Product Type
Tube amplifier
Brand
Unison Research
Audio outputs
1 tape output, 1 stereo RCA subwoofer output
Number of channels
2
Analog inputs
4 line-level inputs
Subwoofer output
Yes
Output power
23 W
Color
Walnut
Technology
Feedback: 14 dB
Input impedance: 47 kΩ / 100 pF
Output impedance: 6 Ω
Tubes: 2 x 845 selected, 4 x ECC82/12AU7 selected
Amplification technology
Pure class A
Single-ended output stage
Power consumption
300 VA
Frequency response
20 Hz - 50 kHz, +0 dB / -1 dB at 12 W
Width
37.0 cm
Depth
57.0 cm
Height
26.0 cm
Unit weight
30.5 kg
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