DC Microvolt-Amperemeter 425A

• Country
• United States of America (USA)

• Manufacturer / Brand
• Hewlett-Packard, (HP); Palo Alto, CA

• Year
• 1958

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 109139

• Picture
• Schematics

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

• Number of Tubes
• 4

• Valves / Tubes
• 5751 12AX7 12AT7 6X4 0B2 0A2

• Number of Transistors
• 2

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 115; 230 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: DC Microvolt-Amperemeter 425A - Hewlett-Packard, HP; Palo Alto

• Shape
• Tablemodel, high profile (upright - NOT Cathedral nor decorative).

• Dimensions (WHD)
• 180 x 255 x 275 mm / 7.1 x 10 x 10.8 inch

• Notes
• Messbereiche:
  Microvolt: 10, 30, 100;
  Millivolt: 0.3, 1, 3, 10, 30;
  Volt: 0.1, 0.3, 1;
  Micro-Microamperes: 10, 30, 100;
  Milli-Microamperes: 0.3, 1, 3, 10, 30;
  Microamperes: 0.1, 0.3, 1;
  Milliamperes: 0.003, 0.01, 0.03, 0.1, 0.3, 1, 3.
  Spiegelskala mit 0-Punkt in der Mitte.

• Net weight (2.2 lb = 1 kg)
• 6.1 kg / 13 lb 7 oz (13.436 lb)

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

• Mentioned in
• -- Original prospect or advert (Electronic Design, Nov. 26, 1958, page 111 "The all-new HP 425A" ad)

• Author
• Model page created by Richard Gajics. See "Data change" for further contributors.

• Other Models

• Here you find 392 models, 360 with images and 138 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA