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Unison Research S9 Valve Integrated Amplifier
s9-p2s9-p3s9-retro

Unison Research S9 Valve Integrated Amplifier

Product Description

The S9 is an integrated stereo amplifier with the output power stage is a single ended parallel in pure class A . The output power is about 35 watt per channel.
The output power valves of this amplifier are the SV572 from the russian Svetlana. Maybe, actually, this brand is the best factory for valves.
The main characteristics of SV 572 are: Directly heated thoriated tungsten filament for soft glow and warm sound.Hard glass envelope with white ceramic base. Low microphonic construction with ceramic internal spacers. Graphite plate with titanium coating for extremely high power capability. Small physical size. The bias of output stage is manual controlled for each tube and it has obtained by aid of a precision analogic mA meter.
The output transformers have been studied, designed and produced in our factory to exalt at maximum the exceptional sound characteristics of the SV572. The total negative feedback of S9 is very low, about 9 dB, nonetheless is bandwidth is from 30Hz to 50kHz with of THD. The anodic power supply, more than 1kV, has supported with 8.000 uF capacitors filters !! The filaments of each power valves has supplied by 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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