542R Ch= 542

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

Data
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  • Year
  • 1939
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 168661

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 455 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Alternating Current supply (AC) / 200; 240 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 6 inch = 15.2 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 542R Ch= 542 - Standard Telephones and Cables
  • Shape
  • Tablemodel, high profile (upright - NOT Cathedral nor decorative).
  • Dimensions (WHD)
  • 360 x 415 x 265 mm / 14.2 x 16.3 x 10.4 inch
  • Notes

  • Models 542S & 542R

    These are AC, dual-wave mantel models, Model 542S being housed in a horizontal and 542R in an upright mantel cabinet as illustrated. Each is built on a compact chassis and is provided with a large, fully edge-lit, multi-coloured dial, glass bezel, and black Bakelite escutcheon with inlaid medallion.

    Except for the cabinet design these models are identical, so that the review given below on a Model 542R submitted to "Radio World" last month for test, applies equally well to both receivers.

    Radio World Test Report on Model 542R.

    The Model 542R is assembled on a chassis measuring 10½" long by 8" wide by 2½" deep, the approximate dimensions of the walnut veneer cabinet housing it is 18" long by 10" wide by 10" deep. Five latest type octal-based valves are used, comprising a 6K6G mixer oscillator, 6D6 IF amplifier, 6Q7G combined diode second detector, AVC voltage generator and triode audio driver, 6AG6G high-gain output pentode and 5Z4G rectifier. The receiver is designed for operation from AC mains within the limits of 190 to 250 volts at 40 to 60 cycles.

    Main technical features include straight-line frequency tuning, an effective AVC system, step-by-step tone control, permeability tuned IF transformers, provision for pick-up, and threshold sensitivity control.

    The new dial fitted to this and other latest STC models is well worthy of mention. A "spin" type dial with flywheel loading, it has a particularly smooth action with no trace of backlash. The drive ratio has been well chosen, for, while it makes fine-tuning on the short waves a simple matter, no laborious turning of the knob is necessary to traverse the entire scale. Several flicks of the tuning knob will send the pointer traveling smoothly right across the band.

    Broadcast station calls are grouped in States, a different colour being used for each. On the shortwave scale, which is calibrated in metres, the five broadcast bands are clearly indicated.

    Waveband coverage is from 1600 to 540 kc on the broadcast band, which includes the additional frequencies allocated at Cairo last year, and from 16.5 to 52 metres on the short waves.

    There are four controls; tone, tuning, volume, and wave-change.

    On test, the Model 542R proved an excellent performer on both wave bands. The AVC system is very effective, its value being best appreciated during the reception of shortwave transmissions from powerful overseas stations. All of these provide excellent entertainment under average conditions, signals being particularly steady with perfect readability.

    On the broadcast band the performance is also above the ordinary. Sensitivity is well above the average, while tone is also unusually good, being actually better than that of some consoles on the market. Taken all round, the Model 542R represents excellent value at 20 guineas, and is a worthy successor to the STC Model 528F that has proved such an excellent seller throughout the Commonwealth during the past twelve months

    Editor’s note: The illustrations shown in this article are incorrect as the radios have 4 knobs. The S & R designations are swapped in the original document.

    The Australasian Radio World. November 1, 1939. Page 29

  • Price in first year of sale
  • 21.00 AUS £
  • Circuit diagram reference
  • Australian Official Radio Service Manual Vol. IV
  • Author
  • Model page created by Stuart Irwin. See "Data change" for further contributors.

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