Vacuum-Tube Voltmeter 728A

General Radio Company; Cambridge (MA)

  • Year
  • 1949 ??
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 357035
    • alternative name: GenRad

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

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • Dry Batteries / 3 x 45 & 2 x 1.5 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • from Radiomuseum.org
  • Model: Vacuum-Tube Voltmeter 728A - General Radio Company;
  • Notes
  • 3 (2x1.5) V Dry Cell for Filament.

    One of the 45V batteries uses a center tap for +/-22.5V.

  • Mentioned in
  • Vacuum-Tube Voltmeters, John F. Rider, 2nd Edition, 1951
  • Author
  • Model page created by Wolfgang Müllner. See "Data change" for further contributors.

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