OTB Type A

OTB (Brand), Harding, Holland & Fry Ltd.; London

Dati
Forum
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Collezioni

  • Anno
  • 1923
  • Categoria
  • Radio a galena (a cristallo o a diodo, senza valvole o transistores)
  • Radiomuseum.org ID
  • 76224
    • Brand: OTB (O.T.B.)

 Specifiche tecniche

  • Principio generale
  • Rivelazione a galena / semi-conducteur
  • N. di circuiti accordati
  • 1 Circuiti Mod. Amp. (AM)
  • Gamme d'onda
  • Solo onde medie (OM).
  • Tensioni di funzionamento
  • Alimentazione non richiesta
  • Altoparlante
  • - Per cuffie o amplificatori esterni
  • Materiali
  • Mobile in legno
  • Radiomuseum.org
  • Modello: OTB Type A - OTB Brand, Harding, Holland &
  • Forma
  • Diverse forme (descritte nelle note).
  • Dimensioni (LxAxP)
  • 0 x 2.25 x 0 inch / 0 x 57 x 0 mm
  • Annotazioni

  • Compact crystal detector receiver housed in a circular wooden cabinet stamped with the B.B.C. mark of approval. The front panel carries the tuning dial and terminals for aerial, earth, and headphones. Type A is fitted with outside ordinary nickel‑plated terminals and omits the internal lightning arrester found on the companion model. The set was supplied complete and guaranteed, with each unit B.B.C. stamped and finished in selected wood.

    Technical data:
    Single‑circuit crystal receiver using a fixed aerial coupling and adjustable cat‑whisker detector. Terminals for aerial, earth, and phones.

    Turned Mahogany lidded box, 5"dia.; BBC/PMG stamp, GPO No.745. 

    Notes:
    Advertised as “Absolutely the Finest on the Market.” Sold at 25 shillings plus 1 shilling for the B.B.C. stamp. Distributed wholesale and through retailers by Harding, Holland & Fry Ltd., 27 Garlick Hill, London, E.C.4.

    See also Type B  incorporating additional refinements.

    Correction:
    Two period advertisements for the O.T.B. Crystal Set, distributed by Harding, Holland & Fry Ltd., London, present conflicting descriptions of the Type A and Type B models. The earlier advert (likely 1923) mistakenly reversed the technical details. The later advert clarifies the correct specifications:

    Model Description Price Features
    Type A Basic version 25/‑ + 1/‑ BBC stamp Ordinary outside nickel‑plated terminals; no lightning arrester
    Type B Deluxe version (illustrated) 30/‑ + 1/‑ BBC stamp Special plug‑in terminals on sides; internal lightning arrester; operable with cover on, no disconnection required
  • Prezzo nel primo anno
  • 1.30 £
  • Bibliografia
  • -- Original prospect or advert (The Radio Times, 28 Dec 1923, p. 34.)
  • Letteratura / Schemi (1)
  • -- Original prospect or advert (Wireless Weekly Jun 30, 1924, p.267.)

 Collezioni | Musei | Letteratura

Collezioni

Il modello OTB fa parte delle collezioni dei seguenti membri.

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