Portogram A28

Portogram Radio Electrical Ind. Ltd.; London

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  • Year
  • 1954 ?
  • Category
  • Sound/Video Recorder and/or Player
  • Radiomuseum.org ID
  • 371035

 Technical Specifications

  • Number of Tubes
  • 3
  • Valves / Tubes
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Changer (Record changer)
  • Power type and voltage
  • Alternating Current supply (AC) / 110 / 250 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical
  • Power out
  • 3.5 W (unknown quality)
  • Material
  • Leather / canvas / plastic - over other material
  • from Radiomuseum.org
  • Model: Portogram A28 - Portogram Radio Electrical Ind
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Notes

  • Portable 3‑speed record reproducer with 3‑valve beam‑tetrode amplifier, Collaro automatic mixer‑changer, and elliptical permanent‑magnet loudspeaker. Marketed as “for the connoisseur”, hand‑built for high‑fidelity reproduction. Supplied to schools and government departments.

    Feature Specification
    Power supply 110/250 V AC
    Amplifier 3‑valve beam‑tetrode output
    Pickup “Studio” high‑fidelity crystal
    Turntable Collaro 3‑speed automatic mixer‑change
    Speaker Permanent‑magnet elliptical
    Speeds 33⅓, 45, 78 rpm
    Cabinet Portable suitcase type
    Price 28 gns tax paid

    The A28 was the portable version of Portogram’s mid‑1950s record reproducer series. It shares its chassis and amplifier with the A33 table model.

  • Price in first year of sale
  • 29.40 £
  • Mentioned in
  • -- Original prospect or advert (The Listener Aug 26, 1954, p.338)
  • Literature/Schematics (1)
  • -- Original prospect or advert (The Gramophone Jul 1955, p. xlix.)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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