789

Stromberg-Carlson (Australasia) Pty. Ltd. Sydney

Data
Forum
Pictures
Collections

  • Year
  • 1937
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 165398

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

 Technical Specifications

  • Number of Tubes
  • 7
  • Main principle
  • Superhet with RF-stage; ZF/IF 392 kHz; 3 AF stage(s)
  • Tuned circuits
  • 7 AM circuit(s)
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Storage and/or dry batteries / 135 & 2 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 10 inch = 25.4 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 789 - Stromberg-Carlson Australasia
  • Shape
  • Console, Lowboy (legs < 50 %).
  • Notes

  • Model 789 Stromberg-Carlson Seven-Valve DW battery powered Superhet.

    High sensitivity and low noise level are outstanding features of the latest Model 789 Stromberg-Carlson seven-valve dual-wave release.

    Exceptionally high sensitivity is assured by the use of a 1A4 as RF amplifier, and of two stages of intermediate frequency amplification (also using 1A4's). A KK2 is used as a mixer, with a 1B5 as a second detector, AVC, and first audio stage feeding a 30 driver with a KDDI as class "B" power output stage.

    Throughout the entire design, particular attention has been paid to keeping current consumption as low as possible. A special switch is also incorporated, enabling the dial lights to be extinguished when the set is in operation, further reducing battery drain.

    An edge-lit vertical straight line tuning dial, identical to that used in the eight and nine valve A.C. receivers, is fitted. The stations are marked in large clear-cut figures and are divided vertically into States, while the four international overseas channels are grouped on the left-hand side of the dial.

    The tuning range is from 175-570 metres on the broadcast band and 16.8 to 51 metres on the short waves. A large control knob gives speedy, easy tuning, having dual dial ratios of sixty and ten to one.

    A 10" dust-proof permanent magnetic dynamic speaker is fitted, which, combined with the outstanding acoustic properties of the Concert Grand Cabinet, gives the  789 a high degree of tonal quality and faithfulness of reproduction under a wide range of atmospheric conditions and · geographical obstructions.

    An additional feature is the variable tone control.
    Controls from left to right are as follows:-

    • On-off and dial lights switch,
    • Volume
    • Tone
    • station selector
    • wave changer and gram switch.

    Altogether, the 789 is a dual-wave battery receiver that will fill the demand for a deluxe radio for the man on the land.

    Australasian Radio World, Sep 1, 1937. Page 36.

     

  • Circuit diagram reference
  • Australian Official Radio Service Manual Vol. I
  • Mentioned in
  • Australasian Radio World, Sep 1, 1937. Page 36.
  • Author
  • Model page created by Stuart Irwin. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum