Power Amplifier and Plate Supply Type 420

General Radio Company; Cambridge (MA)

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  • Year
  • 1929
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 328544
    • alternative name: GenRad

 Technical Specifications

  • Number of Tubes
  • 2
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 230 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Power Amplifier and Plate Supply Type 420 - General Radio Company;
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • Power Amplifier and Plate Supply

    This unit operates from 230 volt (50 cycle) A.C. and provides plate voltages of 45, 90 and 130 in addition to supplying the proper plate voltage for the UX -171 tube of the power amplifier.

    An outstanding feature of the type 420 is that it has no variable resistance voltage controls to get out of order and cause noisy reception. Voltages in this unit are controlled by fixed resistances tightly sealed from dust and moisture.

    This unit is designed for the UX -213 Rectron rectifier tube and UX -171 power tube in the amplifier. It is contained in a metal case with black crystalline finish. The type 420 may be used to replace "B" batteries with all popular makes and circuits of radio receivers regardless of whether they may be operated by dry cell or storage battery tubes.

  • Mentioned in
  • -- Collector info (Sammler) (HRSA Radio Waves Magazine #156, April 2021, Page 16.)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

 Collections | Museums | Literature

Literature

The model Power Amplifier and Plate Supply is documented in the following literature.

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