• Country
• Germany

• Manufacturer / Brand
• Maihak AG, H.; Hamburg - Winterhude

• Year
• 1956 ?

• Category
• Sound/Video Recorder and/or Player

• Radiomuseum.org ID
• 231639

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 5

• Semiconductors
• OC603 OC603 OC604 OC604spez OC604spez

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Tape Recorder

• Power type and voltage
• Dry Batteries

• Loudspeaker
• - For headphones or amp.

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: Reportofon MMK 3 tr - Maihak AG, H.; Hamburg -

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 320 x 120 x 250 mm / 12.6 x 4.7 x 9.8 inch

• Notes

• Vollspur; Antrieb durch Federwerk, Bandgeschwindigkeit: 19 cm/s.

  Siehe auch Maihak Reportofon MMK3 mit Röhrenbestückung.

  "History of clockwork-driven Tape Recorders" by Roland Schellin refers 1955 as the beginning of production of the MMK3 tr. However, the schematic shows the initial drawing date June, 1956.

  This recorder uses the first transistors made by Telefunken already advertised in 1955. The same transistors were used in Telefunken TR1 radio in 1955.

• Net weight (2.2 lb = 1 kg)
• 7.8 kg / 17 lb 2.9 oz (17.181 lb)

• Mentioned in
• Schellin, Roland: Federwerk-Tonbandgeräte History of clock-work-driven tape, Funk-Verlag Hein, 2009

• Author
• Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

• Other Models

• Here you find 22 models, 20 with images and 12 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Maihak AG, H.; Hamburg - Winterhude