3-tube Receiver Harlow Calderwood

Homebrew - ORIGINAL, USA

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  • Year
  • 1925 ??
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 230061

 Technical Specifications

  • Number of Tubes
  • 3
  • Valves / Tubes
  • Main principle
  • TRF (Tuned-Radio-Frequency but use of regeneration unknown)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 3-tube Receiver Harlow Calderwood - Homebrew - ORIGINAL, USA
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes

  • Built by Harlow Calderwood, using a Flemming box.

    All components could be bought from mail order houses, e.g. Andrae, where the catalogue R-6 offers many parts:<br />

    the straight metal name plates could be bought e.g.from Andrae catalog R-6, page 60, as well as the curved 90° "increase current" ones from the same catalog page. ACME A-2 semi mounted p.49. Tap switches, contacts and switch stops, all at p.50.

    The DeForest coupler is not very clever placed. To close the lid the coils must be pulled out. Even worse: I you attempted to close the lid with coils in place....the risk of damage is rather high!

    The case is obviously from a Flemming Quack set (maybe also the semi circular scales).

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The model 3-tube Receiver is part of the collections of the following members.

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