Grundig TK 747

Data

General

• Manufacturer: Grundig AG, Fürth, Germany
• Model: TK 747 Hifi
• Type: Tape case
• Years of manufacture: 1975 - 1977
• Manufactured in: Fürth, Germany
• Color: Black
• Remote control: footswitch 255 for start/stop
• Power supply
  • TK 747: 110 V, 220 V AC, 50 Hz
  • TK 747 U: 110 V, 120 V, 220 V, 240 V, AC, 50 Hz/ 60 Hz
• Power consumption: 55 watts
• Dimensions: 500 x 152 x 310 mm (WHT)
• Weight: 12,0 kg
• Original price approx.: 950 DM

Connections

• Number of outputs:
  • DIN: 2 x amplifier (combined with input radio) 800 mV at 20 kΩ.
  • DIN: 2 x loudspeakers each 7 W at 4 Ω (music power).
  • DIN: 1 x headphone (cube plug) 2 V at 100 Ω.
• Number of inputs:
  • DIN: 2 x Micro 1 - 100 mV at 100 kΩ.
  • DIN: 2 radio 3 - 300 mV at 30 kΩ
  • DIN: 2 x Phono100 - 10,000 mV at 1 MΩ

Technical Data

• max. coil diameter: 18 cm
• drive: 1 motor, belt drive
• Heads: 3, 1 x record, 1 x playback, 1 x erase.
• Tracks: 4 (quarter track)
• Tape speeds
  • 4.75 cm/ s, 9.5 cm/ s, 19 cm/ s
• Slip:
• Synchronous fluctuations:
• Pitch variations:
  • 4.75 cm/ s ≤ ± 0.2 %.
  • 9.5 cm/ s ≤ ± 0.12 %.
  • 19 cm/ s ≤ ± 0.07 %.
• Overall frequency response:
  • 4.75 cm/ s: 30 Hz - 8,000 Hz.
  • 9.5 cm/ s: 30 Hz - 15,000 Hz
  • 19 cm/ s: 30 Hz - 18,000 Hz
• Signal-to-noise ratio:
• Extraneous voltage spacing:
• Noise-to-noise ratio:
  • 4.75 cm/ s: > 57 dB
  • 9.5 cm/ s: > 60 dB

19 cm/ s: > 62 dB

• Distortion factor:
• Equalization:
• Crosstalk attenuation:
• Cancellation attenuation:
• Premagnetization and cancellation frequency:
• Transistors.

29 silicon, 4 germanium, 1 field effect transistor

• Diodes
  • 20 silicon, 1 germanium diode, 1 rectifier
• Fuses
  • 5 x 20 mm; 2 x 1 A slow blow; 1 x 0.8 A slow blow
• Total playing time with a full coil 18 cm ø with mono
  • Long playing tape
    • 4.75 cm/ s ∼ 12 hours, 9.5 cm/s ∼ 6 hours, 19 cm/s ∼ 3 hours
  • 640 m duoband
    • 4.75 cm/ s ∼ 14 hours, 9.5 cm/s ∼ 7 hours, 19 cm/s ∼ 3.5 hours
  • 730 m duoband
    • 4.75 cm/ s ∼ 16 hours, 9.5 cm/s ∼ 8 hours, 19 cm/s ∼ 4 hours
• Rewind time
  • approx. 255 sec. for duoband 730 m on reel 18
• Automatics
  • Leveling and switching off at the end of the tape

Special Features

• Horizontal/vertical operation, "keyholes" for hanging on the wall.
• Tape tension control
• Integrated stereo amplifier with two speakers
• Smoked glass hood

Accessories

• Remote control: footswitch 225 for start/stop during recording/playback
• Retrofit kit 137: Socket "Dia Slide", connection of a control unit for slide/slide film projection
• Sonodia 272 a in combination with retrofit kit 137 to control the projector when dubbing slide series
• Retrofit kit 132 to convert the unit to 60 Hz
• Stereo microphone
  • GCMS 332 stereo condenser microphone
• Mono microphones
  • GCM 319 Condenser Microphone
  • GDM 308 Dynamic switch microphone for start/stop remote control during recording/playback
  • GDM 314
• Windscreen 404 for mono microphones when talking close-up
• Microphone extension cable
  • Type 267 with intermediate transformer, 10 m long
  • Type 268 without intermediate transformer, 10 m long
  • Type 274 for GDSM 331, 10 m long
  • Type 291 for GCM 319 and GCMS 332, 10 m long
• Stereo mixer 422

Remarks

• Other models of the same series:
• Grundig TK 547
• Grundig TK 747
• Grundig TK 847
• Grundig TK 850 FM
• Grundig TS 1000

Pictures

• Extract from brochure: Grundig TK 747