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
lowminus;about 9 dBminus;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 AmplifierOutput Stage: single ended parallel A classOutput Power: 30WInputs: 4 lineInput Impedance: 47 kOhmOutputs: 1 tape, loudspeakersOutput Impedance: 6 ohmFeedback factor: 14dBFrequency Response: 20 minus; 50000 HzValves: 4 x SV572-10,4 x ECC82Remote Control: IR for volumePower Consumption: 700W maxDimension: 16.1 x 22.4 x 9.9 inchNet Weight: 110 lbs



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