Tube Tech SSA2B Summing Amplifier, from Tube-Tech

• Impedance
  Input: 50 kohm
  Output: < 60 ohm
• Frequency response @ -3 dB: 5 Hz to 100 kHz
• Distortion THD+N @ 40 Hz
  0 dBu < 0,05 %
  +10 dBu < 0,05 %
  Max. output: : +26 dBu 1 %
  Max input: +30 dBu 1 %
• Noise Rg=200 ohm
  Output Gain @                    0 dB                 + 10 dB
  Inputs used                     1          4+8        1           4+8
  22Hz-22kHz:               < -90     < -85    < -80    < -75 dBu
  CCIR-468-4:               < -80     < -75    < -70    < -65 dBu
• CMRR @ 10 kHz: < -60 dB
• Gain:
  0.5dB steps +/- 0-3 dB
  1 dB steps: +/- 3-6 dB
  2 dB steps: +/- 6-10 dB
• Gain tracking
  Between channels < 0.1 dB
• Crosstalk @ 10 kHz: < -70 dB
• Tubes
  ECC 82 2 pcs.
  ECC 83 2 pcs.
  ECC 88 4 pcs.
• Dimensions
  Height: 2 units 88 mm 3.5"
  Width: 483 mm 19.0"
  Depth: 205 mm 8.1"
• Weight
  Net: 5.4 kg 11.9 lbs.
  Shipping: 6,5 kg 14,3 lbs.
• Power requirements
  @ 115 V/230 V, 50-60 Hz: 40-55 W
• Notes
  All specifications @ RL=600 ohm
  Lydkraft reserves the right to alter specifications without prior notice

The SSA 2B is the sound solution to the bottleneck problems arising when down-mixing digital recordings on DAW's. The 10->2 channel down-mixing unit directly targets the critical mastering process: Sonically it easily outperforms the quality of digital audio workstations and even betters the performance of mixing amplifiers built into the most high-end analogue consoles.

The TUBE-TECH SSA 2B Stereo Summing Amplifier features two very low noise / low distortion summing amplifiers with a very wide frequency response.
The inputs are transformer balanced and the circuits are symmetrical from input to output. The inputs are capable of handling extremely high input levels.
The Outputs are balanced and have fully floating transformers with a static screen. The power supply and the sidechain circuits are based on a solid-state circuit.
With the exception of the output stage all DC voltages are stabilised.

Product Features

• 10 stereo input - 1 stereo output , or 4 mono, 8 stereo input - 1 stereo output 
• 23-step gold plated output gain control
• Master Output Gain: -10 dB to +10 dB
• Fully symmetrical circuitry from input to output
• Zero field transformer balanced inputs.
• Maximum input > +30 dBu
• Low noise: < -85 dBu @ all inputs terminated
• Two large VU meters showing output level
• Frequency response 5 Hz - 100 kHz
• Distortion < 0.05 %