Unison Research SH Single Ended Class A Headphone Amplifier

Unison Research's tradition of Single Ended is well known in markets around the world and has been used to make a component aimed solely at quality. SH is a Single Ended Class A headphone amplifier, made with a two-stage tube circuit and preceded by a passive volume control. The refinement of the tubes is combined with modernity through the internal Dac and the USB input, making the SH the ideal instrument for listening to liquid music with headphones.

Asynchronous USB interface compatible with USB 2.0 Audio Class
Accepts PCM up to 384kHz and DSD up to 128
Resolution up to 32 bit
Latest generation ESS Saber DAC (ESS ES9010K2M) with jitter elimination circuit
Galvanic isolation between USB interface and
Clock conversion circuit low phase noise residing in the "clean" power supply area to preserve the performance guaranteed by the low jitter
110dB SNR (at 1kHz, "A" weighted, 192kHZ)
0.008% THD + N (at 1kHz, -3dBFS)

Specifications

• Maximum output voltage (THD 1%):
  "High sensitivity" output
  0.5 V into 150 ohm, 0.45 V into 33 ohm, 0.4 V into 10 ohm
  "Low sensitivity" output
  1.4 V into 150 ohm, 1.1 V into 33 ohm, 0.6 V into 10 ohms
• Frequency response:
  -0.1 dB @ 10Hz / 3-dB @ 50 kHz ("Low sensitivity" output into 33 ohms)
• Input impedance: 20k ohm // 100 pF
• Sensitivity:
  0.67 V input for 0.33 V output ("High sensitivity" output, 10 ohm)
       0.67 V input for 1 V output ("Low sensitivity" output, 33 ohm)
• Input stage:
  Pure Class A, ECC83 / 12AX7
• Output stage:
  Class A, 2 EL84 connected to triode
• Inputs: 1 RCA line, 1 USB
• Outputs: 2 in parallel
• Feedback factor: 16 dB
• Output Impedance: 6.9ohm.
• Damping factor: 3 to 20 ohms
• THD: <0.2% @ 1kHz, 0.5V, <0.8% up to 1 V ("Low sens." Output on 33 ohm)
• Absorption: 45 W
• Dimensions: 22.5cm x 12.6cm x 32.2cm
• Weight: 6 kg