Monotape

Portogram Radio Electrical Ind. Ltd.; London

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  • Year
  • 1959 ?
  • Category
  • Sound/Video Recorder and/or Player
  • Radiomuseum.org ID
  • 102327

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Tape Recorder
  • Power type and voltage
  • Alternating Current supply (AC) / 200-240 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical
  • Power out
  • 3.5 W (unknown quality)
  • from Radiomuseum.org
  • Model: Monotape - Portogram Radio Electrical Ind
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • Portable dual‑track tape recorder, single speed (32 in/sec ≈ 3 ¾ ips), using the B.S.R. “Monodeck” mechanism. Six‑valve amplifier with beam‑tetrode output and luminous level indicator, intended for domestic and educational use.

    Technical data:

    Tape deck: B.S.R. Monodeck single‑speed
    Tape speed: 3 ¾ ips  
    Track format: Dual‑track, single direction
    Bias oscillator: 50 kHz; bias 55 V, erase 30 V
    Inputs: Microphone 3.5 mV, Gram 200 mV
    Output: Monitor 0.25 V
    Output power: ≈ 3.5 W
    Speaker: Elliptical permanent‑magnet
    Cabinet: Portable suitcase type

    Early Portogram tape recorder using the six‑valve chassis later fitted to the Portotape series. Single‑speed design; superseded by the three‑speed Portotape.

  • Net weight (2.2 lb = 1 kg)
  • 8.6 kg / 18 lb 15.1 oz (18.943 lb)
  • Circuit diagram reference
  • Radio and TV Servicing books (R&TVS) book
  • Mentioned in
  • -- Original-techn. papers.
  • Author
  • Model page created by Peter Hoddow. See "Data change" for further contributors.

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