Powers just fine. The plug need a bit of attention but is intact and functional. 

General

• Manufacturer: Grundig
• Model No.: SV-140
• Type: Integrated Amplifier
• Made in: Germany
• Colour: Front panel made of brushed aluminium silver / black, precious wood case in matt walnut, optional natural teak or rosewood matt
• Type: Stereo Integrated Amplifier
• Construction period: approx. 1968 - 1971
• Power consumption: 250 W
• Dimensions: (WxHxD) 500 x 150 x 290 mm
• Weight: 16.2 kg
• Fixed price: 1.245,- DM

Connections

• Number of inputs:
  • Phono 1 (TA 1): 5 mV, 47 kOhm, max. 100 mV
  • Phono 2 (TA 2): switchable, level control
    • Phono MM: 3.7 mV, 47 kOhm, max. 100 mV
    • Phono crystal: 250 mV, 1 MOHm, max. 3V
  • Universal / Microphone switchable:
    • Universal, depending on contact occupancy:
      • Low level: 10 mV, 8.3 kOhm, max. 150mV or
      • High-level: 300 mV, 250 kOhm, max. 5V
    • Microphone: 7 mV, 100 kOhm, max. 200 mV
  • Tuner: 250 mV / 470 kOhm, max. 5V
  • Tape Deck: 250 mV / 470 kOhm, max. 5V
  • Monitor: 250 mV / 470 kOhm, max. 5V (listening, backband control for tape recording)
• Number of outputs:
  • Tape Deck: 0.1 - 2 mV per kOhm
  • Preamp output: 1 V at 200 ohms, max. 1.55 V (for connecting additional amplifiers)
  • DIN jacks for 2 speakers L/R, 4 - 16 ohms
  • Stereo Headphones
  • 2 mains output sockets

Specifications

• Continuous power (at harmonic distortion)
  • 8 Ohm: 2 x 35W DIN
  • 4 Ohm: 2 x 50W DIN
• Dynamic performance
  • 8 Ohms:
  • 4 Ohms: 140W DIN
• THD: < 0.5% at 40-16,000 Hz and 0.1% at 1,000 Hz 50 W into 4 ohms
• Attenuation factor: 26 at 4 ohms
• Total frequency response: 20 - 20,000 Hz +/- 1 dB
• Power bandwidth: 10 - 50,000 Hz
• Signal-to-noise ratio:
  • Phono 1 & 2: >60 dB
  • Tuner: >86 dB
  • Tape: >86 dB
  • Crosstalk attenuation 46 dB / 1,000 Hz, 40 dB / 250 - 10,000 Hz
• Stereo channel separation: >50 dB
• Noise voltage: >75 dB
• Equalizer:
  • Low bass at 40Hz: ± 15 dB
  • Bass at 200Hz: ± 12 dB
  • Mid 3,000Hz: ± 12 dB
  • Tweeter at 7,500Hz: ± 12 dB
  • Super tweeter at 16,000Hz: ± 15 dB
• Loudness / Contour 1, 100Hz + 10 dB, 7,500Hz + 4 dB
• Contour 2, 100Hz + 16 dB, 7500Hz + 6 dB

Special features

• Sliders for:
  • Volume
  • Balance
  • Low bass
  • Bass
  • In the middle
  • Tweeter
  • Super Tweeter
• Linear button (tone control off)
• Contour keys 1 & 2
• Tape Monitor Button
• High Filter
• Speaker on/off
• Mono / Stereo button
• Overload protection