• Country
• Norway

• Manufacturer / Brand
• Tandberg Radio; Oslo

• Year
• 1966–1968 ?

• Category
• Sound/Video Recorder and/or Player

• Radiomuseum.org ID
• 273915

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

• Number of Tubes
• 10

• Valves / Tubes
• ECC83 ECC83 ECC81 ECC81 EAM86 EAM86 ECC83 ECC83 ECC82 ECC82

• Number of Transistors
• 8

• Semiconductors
• SE4001 SE6001 2N3702 2N3705 2N3702 2N3705 U2848 U2848 B250C75 B30C1000

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Tape Recorder

• Power type and voltage
• Alternating Current supply (AC) / 60 Hz, 115V or 50 Hz, 110; 125; 145; 200; 220; 245 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Reel-to-Reel Tape Recorder 64X - Tandberg Radio; Oslo

• Shape
• Tablemodel, low profile (big size).

• Notes

• Four-track stereo / mono, 3 speeds: 7.5 inch/sec (19cm/sec) @ 30-20000 Hz, 3.75 inch/sec (9.5 cm/sec) @ 30-14000 Hz, 1.875 inch/sec (4.75 cm/sec) @ 50-7000 Hz. Channel separation better than 60 dB.  4 separate tape heads: erasing head, recording head, playback head, and bias head.  Synchronous motor. 3 channel output, left, right and center (monoaural).

  The "X" in "64X" stood for "Cross Field Head." It was an extra head that fed a bias signal from behind the tape across to the opposite channel record head. The cross field head system is intended to give lower distortion during recording. It doesn't affect playback, so it has no effect when playing pre-recorded tapes or tapes recorded on another machine.

  This hybrid set used 10 tubes, 8 transistors, and 2 selenium rectifiers.

  U.S. Version for 60 Hz, 115V has an Interlock system for mains input.
  See the schematic for other differences (motors, transformer) regarding the mains frequency and voltages.

• Literature/Schematics (1)
• -- Schematic

• Author
• Model page created by Rodney Boleyn. See "Data change" for further contributors.

• Other Models

• Here you find 203 models, 175 with images and 107 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Tandberg Radio; Oslo