Mozzullphone 488

Mozzullphone (Brand), BDS Wireless Ltd.; Birmingham

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  • Year
  • 1923/1924
  • Category
  • Detector-Radio (Crystal or diode, without tubes/transistors)
  • Radiomuseum.org ID
  • 247464

 Technical Specifications

  • Main principle
  • Crystal or Solid State Detector with Amplifer
  • Tuned circuits
  • 1 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Mozzullphone 488 - Mozzullphone Brand, BDS
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 10.5 x 7.5 x 7.5 inch / 267 x 191 x 191 mm
  • Notes

  • The Mozzullphone range was promoted under the slogan “Maximum Efficiency at Minimum Cost” in Broadcaster & Wireless Retailer, April 1925 (p. 20). BDS Wireless Co. Ltd. positioned the set as a reliable, repeat‑order product for dealers, emphasizing its patent detector and universal adjustment. Surviving examples are rare; most were sold through wholesale stockists listed in the company’s illustrated catalogue.

    It incorporated a patented sensitive detector with universal adjustment, allowing detection by crystal and cats‑whisker or by twin‑crystal operation. Designed for Chelmsford reception, the set was advertised at £1 17 s 6 d (without accessories) or £2 6 s 0 d complete. The internal layout provided accommodation for five headphone pairs and an optional matching one‑valve amplifier housed in the same compartment.

    Technical Notes

    • BBC stamp and GPO registration numbers: 488 (Crystal Set) and 4416 (Amplifier).
    • All metal parts nickel‑plated.
    • The amplifier shared the same cabinet dimensions and finish, forming a compact two‑unit system.
    • The design reflects early British multi‑listener crystal sets intended for group demonstration or classroom use.
  • Price in first year of sale
  • 1.88 £
  • Literature/Schematics (1)
  • -- Original prospect or advert (Broadcaster & Wireless Retailer, April 1925, p. 20.)

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