526B Ch= 52B

Standard Telephones and Cables Pty, Ltd (STC), Sydney

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  • Year
  • 1936
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 335136

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Superheterodyne (common); ZF/IF 450 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Storage and/or dry batteries / 3 x 45 & 2 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 8 inch = 20.3 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 526B Ch= 52B - Standard Telephones and Cables
  • Shape
  • Console with any shape - in general
  • Notes

  • STC Models 520B & 526B are 5-valve receivers designed for dual-wave coverage and operation from battery power supplies. Both these receivers are console-style. The chassis employed in these receivers are known as type “52B” and is fitted with four controls, these being volume, tuning, wave-change (with the extra position for “local broadcast” reception & section for control of dial-scale illumination in accordance with waveband in use) & battery switch.
    The loudspeaker employed is an 8-inch unit of the permanent magnet type.

    Power supply for these receivers is obtained from a 2-volt accumulator “A” & three series-connected 45-volt dry batteries “B”.
    Bias voltages are obtained within the receiver utilizing the voltage drop across two resistors (R6 & R7) which are connected in series between “B” negative and the chassis. Only four battery connections are required, those being grouped and coloured as shown on the diagram.

    The design of the chassis is quite straightforward, the only unusual features being found in the method of “local/distance” switching employed (the direct aerial connection is replaced by the capacity between two twisted wires when the wave-change switch is in the local position), and in the use of transformer-coupling in the audio channel.
    Note that the second IF valve grid is returned direct to earth and receives no bias at all.

    Radio Trade Annual 1939, Page 324.

    See also Model 520B with the same chassis, but different cabinet style.

  • Literature/Schematics (1)
  • -- Original-techn. papers. (Schematic.)
  • Author
  • Model page created by Martin Kent. See "Data change" for further contributors.

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