RFT BG 20-6 Smaragd

Data

RFT Tape Machine BG 20-6 Smaragd

General:

• Manufacturer: RFT Zwönitz
• Model: Smaragd
• Year of manufacture: from ca 1956
• Made in: Germany, GDR
• Color: brown
• Remote control: yes, electric wired
• Power consumption: 250 watts
• Dimensions:
• Weight approx: 20 kg
• New price approx.: 1200 DDR mark

Connections:

• Number of outputs:
  • Radio ect. "diode socket" MONO
  • Loudspeaker: 2 Watt
• Number of inputs:
  • Microphone
  • Radio

Technical data:

• Tube device: Mono
• max. coil diameter: 18 cm
• drive: 1 motor, pole-changing, large flywheel mass, 1 × belt drive
• heads: 1 × erase-/ 1 × sound head, moderate quality
• Tracks: half-track mono
• Tape speeds: 2 ( 9.5 and 19 cm/s )
• Synchronisation fluctuations: 0.3
• Pitch fluctuations:
• Overall frequency response: 40-16,000 Hz at 9.5 cm/s, 40-18,000 Hz at 19 cm/s.
• Signal-to-noise ratio: 45 dB
• Spurious signal-to-noise ratio:
• Distortion: 5%
• Equalization:
• Crosstalk attenuation:
• Cancellation attenuation: max 40 dB
• Premagnetization and extinction frequency:

Special features:

• remote control: yes
  • electromechanical control
  • electric brakes, electric clutches (drive)
  • display tube EM 11 - magic eye !

Remarks

• problems with modern tape material, min 35 µm BASF~ er (tape tension), sound respectable at 19 cm/s

• Other models of the same series:

Pictures