Technics SU-A 2

Data

General

• Manufacturer: Technics
• Model: SU-A 2
• Type: Class A Stereo DC Preamplifier
• Note: Was only built to order in manual labor
• Years of manufacture: 1977 - 1980
• Made in: Japan
• Color: Black
• Power consumption: 240 W, without signal 130 W
• Dimensions (WxHxD): 450 x 205 x 574 mm
• Weight: approx. 38.5 kg
• Original price approx.: 1'600'000 Yen (Japan, 1977), 22'500 DM

Connections

• Number of inputs:
  • Phono 1:
    • MM: 2.5 mV, 500 mV max.
      • Impedance selectable: 22k, 33k, 47k, 75k, 100kOhm
      • Capacitance selectable: 100p, 150p, 200p, 300p, 500pF

MC: 0.1 mV, max. 20 mV

• • • • Impedance selectable: 10, 22, 47, 100, 220 Ohm
  • Phono 2:
    • MM: 2.5 mV, max. 500 mV
      • Impedance selectable: 22k, 33k, 47k, 75k, 100kOhm
      • Capacitance selectable: 100p, 150p, 200p, 300p, 500pF

MC: 0.1 mV, max. 20 mV

• • • • Impedance selectable: 10, 22, 47, 100, 220 Ohm
  • Microphone: 2mV / 600 kOhm, max. 200 mV
  • Tuner: 150mV / 47 kOhm (with level control on rear panel)

AUX: 150mV / 47 kOhm (with level control on rear panel) Tape Play 1, 2, 3: 150mV / 47 kOhm (each with level control on rear panel)

• • Display instruments: External input
• Number of outputs:
  • Tape Rec 1, 2, 3: 150mV / 500 Ohm
  • Pre Out 1, 2: 1 V / 500 Ohm, max. 10 V
  • Remote control output for power on / off of the power amp
  • Headphones: Impedance 4 - 600 Ohm

Technical Data

• Frequency response:
  • Phono 1, 2 MM: DC - 20 kHz, RIAA ± 0.2 dB.
  • Phono 1, 2 MC: 30 Hz - 20 kHz, RIAA ± 0.2 dB

Microphones: 20 Hz - 20 kHz, + 0 -1 dB Tuner: DC - 20 kHz + 0 -0.2 dB Aux: DC - 20 kHz + 0 -0.2 dB

• • Tape 1, 2, 3: DC - 20 kHz + 0 -0.2 dB

Distortion: THD (20Hz - 20kHz)

• • Phono 1, 2 MM:
    • 1 V: 0.003% (VR -30 dB)
    • 10 V: 0.003% (VR max.)
  • Phono 1, 2 MC:
    • 1 V: 0.005% (VR -30 dB).
    • 10 V: 0.005% (VR max.)
  • Microphones:
    • 1 V: 0.005% (VR -30 dB)
    • 10 V: 0.005% (VR max.)
  • Tuner, Aux, Tape 1, 2, 3:
    • 1 V: 0.003% (VR -30 dB)
    • 10 V: 0.003% (VR max.)
• Signal-to-noise ratio:
  • Phono MM:
    • 2.5 mV input voltage: 95 dB
    • 10 mV input voltage: 107dB
  • Phono MC:
    • 0.1 mV input voltage: 80dB (-160 dBV)
• Tone control
  • Bass: operating frequency 15, 60, 240, 500 Hz (selectable)
    • R + L separately adjustable: ± 10 dB (Q= 0.7-7.0).

Treble: Insertion frequency 1, 4, 16 kHz (selectable).

• • • R + L separately adjustable: ± 10 dB (Q= 0.7-7.0)
• Loudness: Variable (rotary dial behind volume control)
• High Filter: 2-stage, selectable frequency 8, 12 kHz, - 18 dB / octave
• Low Filter: 2-stage, insert frequency 15, 30Hz, selectable, - 18 dB / octave
• Low Filter (Subsonic): 30Hz, - 12 dB / octave
• Muting: -∞, Off, -20dB
• Oscillator characteristics: sine wave, square wave: 20Hz - 20kHz (variable adjustable)
• Signal tone: 20Hz - 20kHz (variable adjustable).
• Pink noise: ± 7% of the modulation factor

Special Features

• Indicators and controls Front:
  • Left side:
    • Display instruments with dB scale from -50 to + 10 dB and volt scale from 0.003 - 1 V.
      • Features:
        • Average operating time: 0.33 sec.
        • Peak Display: 0.00005 sec.
        • Peak Hold: max. value stored for 2 hours
    • Power switch
    • Headphone outputs: Impedance 4 - 600 Ohm
    • Filter knobs for: Low, High, EQ Subsonic

Center:

• • • Indicator lights: OSC, Microphones
    • Input selector with indicator lights and memory function for program sources Aux, Tuner, Phono, Tape 1, 2 or 3 Rec/PB)
    • Rec selector with indicator lights for Tape Dubbing (1>2-3, 2>1-3, 3>1-2), Aux, Tuner (with memory function), Phono, Off

Sound position: Rec Out, Pre Out, Off

• • • Mode selector for Reverse, Stereo, L+R, L, R
    • Balance control
    • Mode selector: DC, Low Cut 2 Hz.

Right side:

• • • Phono and cartridge selector: Phono 1 MC/MM, Phono 2 MC/MM
    • Master volume control
    • Variable Loudness control
    • Loudness: On / Off
    • Muting: -∞, Off, -20dB
• Indicators and controls behind the front panel:
  • Left side:
    • Headphone Level Switch
    • Pre Out Connectors
    • Display range instruments with attenuator: -10 dB to -20 dB
    • Input selector: External, Microphones, Pre Out, Rec Out
    • OSC section with frequency control: 20-20,000 Hz and mode selector for square waves, sine waves, off, signal tone, pink noise
    • Microphone section with connectors for 6.3mm jack plugs (Left, Right) with mix control and impedance selector for 600 Ohm, 500 kOhm, Mix, Off
  • Center:
    • Equalizer section with key selector:
      • 4 bands selectable from -10 dB∼-10 dB and bandwidths 0.7-7 as well as frequencies 15-240 Hz, 63-1,000 Hz, 250-4,000 Hz, 1-16 kHz.
  • Right side:
    • Phono selector for phono 1, 2:
      • Input voltage selector for 2.5-10 mV
      • Input selector for impedance: MM 22∼100 kOhm, MC 10∼220 Ohm
      • Input selector for capacitance: 100pF∼500pF
      • Tape 3 selector for input front or rear, PB, Rec Out

Remarks

• Previous model:
  • 1973: SU-10000 preamp
    • SU-10000

• Successor model:
  • 2018: preamplifier SU-R 1
    • SU-R 1

• Other models in the "Century Series":
  • Turntables:
    • SL-1000 MK 2
  • Cartridges:
    • EPC-100 C MK 3
  • Preamplifier:
    • SU-A 2
  • Power amplifier:
    • SE-A 1
  • Cassette Tape Deck:
    • RS-M 95
  • Tape machine:
    • RS-1800
  • Speakers:
    • SB-10000

• At the 1979 Tokyo Audio Fair, the Technics SH-P1 PCM audio processor was introduced to match the series. It was only built to order. It is not known if it was ever built for customers:
  • PCM Audio Processor Technics SH-P1:
    • SH-P1

Pictures

• Image: Technics SU-A 2 front

• Picture: Technics SU-A 2 back

• Image: Technics century series consisting of:
  • Technics SL-1000 MK 2 turntable
  • pickup Technics EPC-100 C MK 3

preamplifier Technics SU-A 2 power amplifier Technics SE-A 1

• • Cassette Tape Deck Technics RS-M 95
  • Tape machine Technics RS-1800
  • Loudspeaker Technics SB-10000

• Excerpt from brochure: Technics Combi SU-A 2 / SE-A 1

Reports

• Report at / some pictures from "Good Old Hifi": [1]

Links

• External link to website "Audio Database, Japan": [2]