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Unison Research S9 Single Ended Triode Valve Integrated Amp

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Unison Research S9 Single Ended
70.00 KGS
Minimum Purchase:
1 unit
Maximum Purchase:
1 unit
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Unison Research S9 Single Ended Triode Valve Integrated Amp

Excellent condition with original packaging and remote.

Parallel single ended, pure Class A amplifier.

Simply a stunning integrated from the Italian Valve masters. The S9 offers 30wpc from two SV572 - 10  power Triode valves with four ECC82 double-triodes completing the valve compliment.  A sublime mix of sheer musicality and passion, the S9 delivers the music with effortless ease in a convincing and natural manner. This example was sold by us a little over 3 years ago and is one-owner from new.
  It is in excellent order with all packing, box and remote.
rrp - £6950.00 GBP
230v  - 50hz

The S9 is an integrated stereo amplifier with an output power stage that is a single-ended parallel design in pure class A. The output power is about 35 watt per channel.
The output power valves for this amplifier are the SV572 from the Russian manufacturer Svetlana. At Unison Research, we believe this may be the best factory for valves.
The SV 572 has a directly-heated thoriated tungsten filament for a soft glow and a warm sound. Other characteristics include a hard glass envelope with white ceramic base, low microphonic construction with ceramic internal spacers, a graphite plate with titanium coating for extremely high power capability and a relatively small physical size. The bias of output stage is manually controlled for each tube, obtained with the aid of a precision analogic mA meter.
The output transformers have been carefully designed and produced in our factory to extract the most out of the exceptional sound characteristics of the SV572. The total negative feedback of S9 is very low–about 9 dB–nonetheless the bandwidth is from 30Hz to 50kHz. The anodic power supply, more than 1kV, is supported with 8.000 uF capacitors filters! The filaments of each of the power valves has supplied with a dedicated power supply with Shotky diodes.

  • Technical characteristics
    • Type: Stereo Integrated Valve Amplifier
    • Output Stage: single ended parallel A class
    • Output Power: 30W
    • Inputs: 4 line
    • Input Impedance: 47 kOhm
    • Outputs: 1 tape, loudspeakers
    • Output Impedance: 6 ohm
    • Feedback factor: 14dB
    • Frequency Response: 20 – 50000 Hz
    • Valves: 4 x SV572-10, 4 x ECC82
    • Remote Control: IR for volume
    • Power Consumption: 700W max
    • Dimension: 16.1 x 22.4 x 9.9 inch
    • Net Weight: 110 lbs
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