Mozzullphone Crystal Set with 1-Valve L.F. Amplifier Insert 4416

Mozzullphone (Brand), BDS Wireless Ltd.; Birmingham

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  • Year
  • 1925 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 371352

 Technical Specifications

  • Number of Tubes
  • 1
  • Valves / Tubes
  • Main principle
  • Crystal or Solid State Detector with Amplifer
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Mozzullphone Crystal Set with 1-Valve L.F. Amplifier Insert 4416 - Mozzullphone Brand, BDS
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes

  • The BDS Mozzullphone Crystal Set with 1‑Valve L.F. Amplifier is a combined crystal receiver and single‑valve audio stage built as a matched pair. The valve unit is constructed in the same polished wooden cabinet as the crystal set, using identical dimensions, finish, and nickel‑plated fittings, giving the appearance of a unified two‑section receiver rather than a later accessory.

    Designed to occupy the internal headphone compartment of the Mozzullphone Crystal Set, the valve stage transforms the passive detector into an active receiver capable of driving several pairs of headphones or a sensitive horn loudspeaker. Once fitted, the set operates as a compact crystal‑plus‑valve arrangement with neatly integrated wiring and external battery terminals.

    Technical Characteristics

    • Device Type: Crystal receiver with single‑valve low‑frequency (L.F.) amplifier.
    • Valve Line‑up: One standard 4‑pin bright‑ or dull‑emitter triode (e.g., DE3, R‑type, or equivalent 2–4 V filament triode).
    • Circuit: Transformer‑coupled L.F. amplification following the crystal detector.
    • Cabinet & Hardware: Polished timber case matching the Mozzullphone receiver; nickel‑plated terminals and fittings throughout.
    • Connections: Separate terminals for H.T. battery, L.T. accumulator, detector input, and headphone or horn‑speaker output.
    • Integration: The amplifier’s form factor is engineered to fit directly into the receiver’s internal compartment, creating a self‑contained two‑unit system when installed.

    GPO Registration:

    • Crystal Set: GPO 488
    • 1‑Valve Amplifier: GPO 4416
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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