Masterpiece V (5)

McMurdo Silver, Inc.(pre WW2); Chicago

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  • Year
  • 1936
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 114350

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

 Technical Specifications

  • Number of Tubes
  • 20
  • Main principle
  • Superhet with RF-stage
  • Wave bands
  • Broadcast, Long Wave and more than two Short Wave bands.
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • 3 Loudspeakers
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Masterpiece V - McMurdo Silver, Inc.pre WW2;
  • Shape
  • Chassis only or for «building in»
  • Notes
  • The McMurdo Silver Masterpiece V
    In 1936 another new model appeared, the Masterpiece V. A complete re-design, in addition to the use of metal tubes were incorporated, the 20 tube set now had a larger and more impressive dial and front panel. The much-refined circuit used two 6K7's in the RF stages, a 6L7 mixer, a 6J7 oscillator, three 6K7's in the IF, a 6Q7 second detector and first audio, a 6K7 and 6H6 as AVC amplifier and rectifier, two 6C5's in push-pull driving two metal 6L6's in the output, and two 5Z3 rectifiers. In addition, the receiver had a volume-expander using a 6L7, 6C5 and a 6H6. A 6G5 Tuning-eye tube replaced the meter used in previous models. This was McMurdo Silver's first major attempt to capture some of Scott's high-end market.

    The IF bandwidth control retained the system used in the previous model; three stages for maximum selectivity, and just one for high-fidelity local reception.

    Bass and treble controls were used, along with the new volume expander control. The audio system was now resistance-coupled, eliminating the interstage transformer which was a feature of earlier designs. Bass and treble controls are cut only but bass boost is accomplished in the volume control circuit. The 25Watt power amplifier drives two Jensen A12 electro-dynamic speaker mounted in a lined infinite baffle speaker enclosure for superior bass response.

    A phono jack was provided so that the audio signal from the radio and phono inputs could be fed to a separate amplifier, perhaps for earphone or public address use. Plugging into this jack disabled the output amplifiers.

  • Source of data
  • -- Collector info (Sammler)

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